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NeoGAFs Kent Brockman

Bill Gates Reportedly Pressured Xbox Team to Respond to Wii Popularity
According to the recent Xbox documentary, Bill Gates presumably put pressure on the Xbox team to pursue motion based gaming in the mid-2000s.

The seventh console generation was considered an interesting point in the history of the video game industry, since this was the period when publishers really started to experiment with motion controls. Following the success of the Nintendo Wii, both Sony and Microsoft released takes on motion control gaming, in the form of PlayStation Move and the Kinect respectively. Though, the latter's development was apparently brought about by none other than one of Microsoft's co-founders.
In Xbox's recently released documentary series Power On: The Story of Xbox, Phil Spencer commented that Bill Gates was disappointed that Xbox hadn't thought to pursue motion control gaming until after Nintendo had already released the Wii. In fact, Xbox's response to the Wii, in the form of the Kinect, would take another four years to release, while the Wii had already been out for a substantial amount of time.
Most members of the gaming community wouldn't normally think to consider Bill Gates' involvement in Xbox, considering how Gates' public attention was usually pointed towards other facets of the tech industry. Although, to think that Gates was apparently the one to put pressure on Xbox to pursue motion control gaming is rather fascinating, despite the fact that Microsoft's Kinect ultimately failed.