Howard Lerman
Vorstandsvorsitzender bei Yext Ltd.
Aktive Beziehungen
Name | Geschlecht | Alter | Unternehmensverbindungen | Zusammenarbeit |
---|---|---|---|---|
Brian Distelburger | M | 45 |
Yext Ltd.
Yext Ltd. Internet Software/ServicesTechnology Services Part of Yext, Inc., Yext Ltd. is a British company that provides digital knowledge management services. The company is based in London, UK. The company was founded by Brian Distelburger, Howard Lerman. Howard Lerman has been the CEO since incorporation. | 18 Jahre |
Michael Walrath | M | 48 | 15 Jahre | |
Shane Battier | M | 45 |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 8 Jahre |
Jon Brod | M | - |
Confide, Inc.
Confide, Inc. Packaged SoftwareTechnology Services Confide, Inc. develops confidential messaging applications. The firm is created to bring off-the-record professional communication to the digital world. Its application is a mobile messaging platform that combines end-to-end encryption with disappearing messages to foster honest, unfiltered and secure communication. The company was founded in 2014 by Howard Lerman, Jonathan Brod, Daniel Sutera, Richard Hong and Jeff Grossman and is headquartered in New York, NY. | 10 Jahre |
Jesse Lipson | M | 46 |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 17 Jahre |
Richard Hong | M | - |
Confide, Inc.
Confide, Inc. Packaged SoftwareTechnology Services Confide, Inc. develops confidential messaging applications. The firm is created to bring off-the-record professional communication to the digital world. Its application is a mobile messaging platform that combines end-to-end encryption with disappearing messages to foster honest, unfiltered and secure communication. The company was founded in 2014 by Howard Lerman, Jonathan Brod, Daniel Sutera, Richard Hong and Jeff Grossman and is headquartered in New York, NY. | 10 Jahre |
Seth Waugh | M | 66 | 4 Jahre | |
James Steele | M | 68 |
Yext Ltd.
Yext Ltd. Internet Software/ServicesTechnology Services Part of Yext, Inc., Yext Ltd. is a British company that provides digital knowledge management services. The company is based in London, UK. The company was founded by Brian Distelburger, Howard Lerman. Howard Lerman has been the CEO since incorporation. | 5 Jahre |
Julie Richardson | F | 61 | 9 Jahre | |
Jeff Grossman | M | - |
Confide, Inc.
Confide, Inc. Packaged SoftwareTechnology Services Confide, Inc. develops confidential messaging applications. The firm is created to bring off-the-record professional communication to the digital world. Its application is a mobile messaging platform that combines end-to-end encryption with disappearing messages to foster honest, unfiltered and secure communication. The company was founded in 2014 by Howard Lerman, Jonathan Brod, Daniel Sutera, Richard Hong and Jeff Grossman and is headquartered in New York, NY. | 10 Jahre |
Sik Shin Ho | M | 55 | 8 Jahre | |
Hillary Smith | F | 58 | 4 Jahre | |
Darryl Bond | M | 44 | 9 Jahre | |
Tamar Yehoshua | F | 59 | 7 Jahre | |
Andrew Sheehan | M | 66 | 16 Jahre | |
Eugene McDonald | M | 91 |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 24 Jahre |
Leigh Sansone | F | - | 3 Jahre | |
Scott H. Kollins | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 24 Jahre |
Joseph A. Izatt | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 23 Jahre |
Brian Schipper | M | 63 | 8 Jahre | |
Clarence G. Newsome | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 22 Jahre |
Laurie Cook | M | - | 3 Jahre |
Beziehungs-Chart
Beziehungen zu mehreren Unternehmen
Ehemalige Beziehungen
Name | Geschlecht | Alter | Unternehmensverbindungen | Zusammenarbeit |
---|---|---|---|---|
Brent Metz | M | - | - | |
Wendi Sturgis | F | 57 |
Yext Ltd.
Yext Ltd. Internet Software/ServicesTechnology Services Part of Yext, Inc., Yext Ltd. is a British company that provides digital knowledge management services. The company is based in London, UK. The company was founded by Brian Distelburger, Howard Lerman. Howard Lerman has been the CEO since incorporation. | 9 Jahre |
Daniel Sutera | M | - |
Confide, Inc.
Confide, Inc. Packaged SoftwareTechnology Services Confide, Inc. develops confidential messaging applications. The firm is created to bring off-the-record professional communication to the digital world. Its application is a mobile messaging platform that combines end-to-end encryption with disappearing messages to foster honest, unfiltered and secure communication. The company was founded in 2014 by Howard Lerman, Jonathan Brod, Daniel Sutera, Richard Hong and Jeff Grossman and is headquartered in New York, NY. | - |
David Rudnitsky | M | 63 | 5 Jahre | |
Matthew Rhodes-Kropf | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | - |
Udayaditya Chatterjee | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 5 Jahre |
Amjad Ramzi Saleh Al-Muasher | M | 50 |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 7 Jahre |
Rick Woods | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 7 Jahre |
Ann Stanberry | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 10 Jahre |
Joshua L. McCarthy | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 7 Jahre |
Kesav K. Mohan | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 9 Jahre |
Keith K. Robinson | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 8 Jahre |
Banu Elizondo | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Christian J. Ward | M | - | 5 Jahre | |
Tom Dixon | M | 43 | - | |
Faheem Bawa | M | 39 | 5 Jahre | |
Chad Fargason | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Scott Seaman | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
John Robert Born | M | 56 |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Mark DeVries | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 5 Jahre |
Gregory Grunberg | M | 51 |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 5 Jahre |
Steven Cakebread | M | 72 | 8 Jahre | |
Jonathan Drillings | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 6 Jahre |
Omar Aguilar | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Peter Fernandez | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Ryan Turner | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Young Cassie | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Clay Hilbert | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 2 Jahre |
Vera Zhang | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Hitesh Anand | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 2 Jahre |
Megann Vaughn | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
James Thayer | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Andrew Symons | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Pia Brandt | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Amir Mokari | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Susan Alban | F | 41 |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
David Pykon | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 2 Jahre |
Lily Daniel | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Sami Rasromani | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 3 Jahre |
Kate Spaziani | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Natasha DeLong | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 22 Jahre |
Dan McCready | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Issac Park | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Larissa Quinn | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Daniel Northrup | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Boyea-Robinson Tynesia | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Mike Mate | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Brian Zaratzian | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Serdar Topak | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Eric Matthews | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 2 Jahre |
Oleg Grodnensky | M | 47 |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Randall Fontes | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 2 Jahre |
Jan Bouten | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 2 Jahre |
Rebecca M. Stafford | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 2 Jahre |
Stan DeLaney | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Mark P. Gartner | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Dustin Willard | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Michael Ranieri | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 2 Jahre |
Richard John Yanuklis | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Sanjay R. Pamnani | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 2 Jahre |
Steven Michael Bischoff | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
David J. Rodriguez | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
David Szekeres | M | 50 |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 3 Jahre |
Zhui Chen | M | 49 |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 3 Jahre |
Christal Jackson | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 3 Jahre |
Lukas Roush | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Eliza Howard Trapp | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Xin Huang | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 7 Jahre |
Jan Christopher Bruennler | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | - |
Phillip Fernandez | M | 63 | 3 Jahre | |
Ryan Rattet | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Justin Ward | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Reggie Love | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 5 Jahre |
Lin Zhou | M | 64 |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 5 Jahre |
ODonnell William | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Nico Richardson | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Ibrahim Mian | M | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 3 Jahre |
Rebecca Levy | F | - |
Duke University
Duke University Other Consumer ServicesConsumer Services Duke University is an academic university that offers undergraduate, graduate and professional programs. It also has publications and research services. The university was founded in 1838 and is headquartered in Durham, NC. | 4 Jahre |
Statistik
Land | Beziehungen | % des Gesamten |
---|---|---|
Vereinigte Staaten | 100 | 100,00% |
Vereinigtes Königreich | 3 | 3,00% |
Alter der Beziehungen
Aktive
Vergangene
Herr
Frau
Aufsichtsräte
Führungskräfte
Ursprung der Beziehungen
- Börse
- Insiders
- Howard Lerman
- Persönliches Netzwerk