Interesting. Terry Myerson was the head of the Windows Phone division through WP 7, 8 and the early part of WP 10 and bore at least some responsibility for its (lack of) success before being promoted to head of the Windows division as a whole. The inclusion of the much derided tie-in ads in Windows required at least his tacit approval.
The general impression was that he was one of Satya Nadella's darlings. One wonders what finally felled him?