Probst joined Electronic Arts in 1984 as the Vice President of Sales. He led the company as President from 1991 until 1998 and served as Chief Executive Officer from 1991 until 2007. Probst was elected as Chairman of the Board of Directors in 1994, and in 2013, he was named Executive Chairman, which he served as until December 2014.
Before Electronic Arts, Probst held the positions of National Sales Manager at Activision, Inc. and National Accounts Manager at The Clorox Company.