As president, he led product groups including Chevrolet, Cadillac and Cruise. In 2018, Ammann transitioned leadership of the Cadillac brand to GM product chief Mark Reuss in order to spend more time focusing on Cruise. Ammann helped guide the 2016 acquisition of Cruise and was subsequently closely involved with its leadership, growing the company from 40 to around 1,000 employees. During his tenure, Ammann led GM to transition its focus to electric and automated vehicles.
