During Fields' tenure at Ford, Fields was credited with replacing a combative senior executive culture with a collaborative one. Former CEO Mullaly recounts a time when Fields took personal responsibility for a failed tailgate latch on an SUV that was delaying the car's launch, in contrast to the rosy projections offered by other senior leaders in the face of serious challenges. In 2015, Ford reported its highest profits and margins ever and was able to distribute $9,300 profit-sharing checks to hourly employees. In 2016, Ford announced plans to redesign its Dearborn headquarters into a walkable, "Silicon Valley"-style campus. As CEO, Fields committed $4.5 billion to electrified vehicles, including the electric Mustang Mach-E, and returned to the 24 Hours of Le Mans race to win on the 50th anniversary of its 1966 victory. In February 2017 Fields drove an investment in Argo AI, combining Ford’s autonomous vehicle development efforts with Argo AI’s robotics and artificial intelligence expertise. On May 22, 2017, Fields announced his retirement from Ford and was replaced by James Hackett.