Kai O. Öistämö is a Finnish businessperson who has been at the head of 7 different companies and holds the position of President & Chief Executive Officer for Vaisala Oyj, Chairman of Fastems Oy Ab, Chairman at Helvar Oy Ab and Chairman at Helvar Ltd.

He is also on the board of Nokia Oyj.

He previously held the position of Chairman of oikian solutions Oy, Chief Operating Officer at InterDigital, Inc., Chief Development Officer & Executive VP at Nokia Oyj, Executive Partner at SIRIS Capital Group LLC, Chairman for Innovaatiorahoituskeskus Business Finland, Chairman for the University of Tampere and Director-Signal Processing Technology at Tampere University of Technology.

He received a graduate degree and a doctorate from Tampere University of Technology.