Michael R. Riksen
Corporate Officer/Principal bei National Public Radio, Inc.
Aktive Beziehungen
| Name | Geschlecht | Alter | Unternehmensverbindungen | Zusammenarbeit |
|---|---|---|---|---|
| Mike Starling | M | - |
National Public Radio, Inc.
 National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| John F. Lansing | M | 67 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 5 Jahre |
| Jarl Mohn | M | 72 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 10 Jahre |
| Roger Sarow | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Joyce MacDonald | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 25 Jahre |
| David Argentieri | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 29 Jahre |
| Deborah Cowan | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 14 Jahre |
| Jeffrey Sine | M | 70 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 4 Jahre |
| Betsy Gardella | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Monique Hanson | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 12 Jahre |
| Marita Rivero | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Florence Rogers | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Greg Petrowich | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Caryn Mathes | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Carlos Watson | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 3 Jahre |
| José A. Fajardo | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Keith Woods | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 14 Jahre |
| Peter Loewenstein | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 53 Jahre |
| Robert Kempf | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 14 Jahre |
| Marty Garrison | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 14 Jahre |
| Kathy Klingler | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Terri Minatra | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 14 Jahre |
| Daniel Greenberg | M | 83 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Connie Walker | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| A. Rima Dael | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 3 Jahre |
| Mike Savage | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Joe O'Connor | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 5 Jahre |
| John McGinn | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Maria O'Mara | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Lynette Clemetson | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Maria O'Mara | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 3 Jahre |
| Jennifer Ferro | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 3 Jahre |
| John Decker | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Telisa Yancy | F | 57 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Tina Pamintuan | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 4 Jahre |
| Mollie Kabler | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 4 Jahre |
| Judith Segura | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 4 Jahre |
| Erika Pulley-Hayes | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 4 Jahre |
| Nico Leone | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 4 Jahre |
| Myrna Johnson | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 4 Jahre |
| Emma Carrasco | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 12 Jahre |
| Fred A. Dust | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 4 Jahre |
| John Stark | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Karen Haefling | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Bernee D. L. Strom | M | 77 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Carol A. Cartwright | M | 82 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Arthur Altschul | M | 59 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Patricia Diaz Dennis | F | 77 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Fabiola Arredondo | F | 57 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| John P. Dubinsky | M | 80 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Jacqueline Reses | F | 54 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Kathleen Jackson | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 28 Jahre |
| Jay Kernis | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 50 Jahre |
| Susan Harmon | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Cephas Bowles | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Rob Gordon | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Ellen Rocco | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| JoAnn Urofsky | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Zach Brand | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 17 Jahre |
| Mark Vogelzang | M | 63 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Chris Boskin | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Joyce D. Slocum | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 9 Jahre |
| Catherine Levene | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 2 Jahre |
| Michael Oreskes | M | 69 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 9 Jahre |
| Howard Wollner | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Cokie Roberts | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Sarah Lumbard | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Joanna Lambert | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Jay Pearce | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Joe Palca | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Neal Zuckerman | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 3 Jahre |
| Patricia Deal Cahill | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 3 Jahre |
| Jonah Shacknai | M | 67 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Will Lee | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
Beziehungs-Chart
Beziehungen zu mehreren Unternehmen
Ehemalige Beziehungen
| Name | Geschlecht | Alter | Unternehmensverbindungen | Zusammenarbeit |
|---|---|---|---|---|
| Paul Haaga | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Gary E. Knell | M | 70 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 2 Jahre |
| LaFontaine E. Oliver | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 6 Jahre |
| Roger LaMay | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Kathryn P. Jensen | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Loren Mayor | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 6 Jahre |
| Dennis L. Haarsager | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Debra Delman | F | 66 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Vivian Luisa Schiller | F | 62 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 2 Jahre |
| Maria Thomas | F | 60 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 7 Jahre |
| Jeff Perkins | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Kinsey Wilson | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 6 Jahre |
| Ronald J. Schiller | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Carlos Alvarez | M | 73 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Wonya Lucas | F | 63 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 3 Jahre |
| Antoine Willem van Agtmael | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Kenneth P. Stern | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Scott Hanley | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 6 Jahre |
| Andi Sporkin | F | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
| Robert G. Holstein | M | - |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | 5 Jahre |
| Golnar Sheikholeslami | F | 56 |
National Public Radio, Inc.
National Public Radio, Inc. Specialty StoresRetail Trade National Public Radio, Inc. produces and distributes noncommercial news and entertainment programs. The company is headquartered in Washington, DC. | - |
Statistik
| Land | Beziehungen | % des Gesamten |
|---|---|---|
| Vereinigte Staaten | 95 | 100,00% |
Alter der Beziehungen
Aktive
Vergangene
Herr
Frau
Aufsichtsräte
Führungskräfte
Ursprung der Beziehungen
- Börse
- Insiders
- Michael R. Riksen
- Persönliches Netzwerk