"Soon after, and a few months before his 70th birthday, Cutler joined the team. He soon “set the bar for how hard people should work and how high they should hold the quality bar,” Multerer said. Two years later, on Nov. 22, 2013, Xbox One shipped in North America.

“Dave designed and wrote the hypervisor for Xbox One,” Multerer said, with an obvious sense of awe. “He wrote the entire bottom of the stack. Because the hypervisor is there, Xbox games can run on Windows. That’s why apps run on Xbox One. The impact of that work is phenomenal. And the amount of work he did was phenomenal.”"

https://news.microsoft.com/features/the-engineers-engineer-c...