Mark Gurman even mentioned a lot of good people were leaving the company. (https://www.bloomberg.com/news/articles/2016-12-20/how-apple...)

Sal Soghoian, former Product Manager of Automation Technologies, although he left because they eliminated his position.

Daniel Gross - https://techcrunch.com/2017/01/10/daniel-gross-of-apple-leav...

Matt Casebolt left for Tesla too

https://9to5mac.com/2017/01/11/matt-casebolt-touchbar-macboo...