Chris Urmson, the CTO of Google's self-driving car project, is stepping down after more than seven years with the unit.
"After leading our cars through the human equivalent of 150 years of driving and helping our project make the leap from pure research to developing a product that we hope someday anyone will be able to use, I am ready for a fresh challenge," he wrote on Medium, noting that Friday was his last day as CTO.
According to the New York Times, Urmson has been unhappy with the direction of the car project under the leadership of John Krafcik, the former Hyundai Motor America chief Google hired last year.
Urmson made no mention of that in his Medium post. "I have every confidence that the mission is in capable hands," he wrote.