Steven H. CollisSteven H. Collis is an American businessman, the chairman, president and chief executive officer of Cencora, previously known as AmerisourceBergen.Early lifeCollis was born in South Africa and attended the University of Witwatersrand, where he earned a Bachelor of Commerce. Collis is Jewish.CareerCollis joined AmerisourceBergen in 2001 as the Senior Vice President. In November 2010, Collis was promoted to president and COO of the company and in July 2011, Collis became CEO.