[puzzle]

In a commencement speech, Jeff Hoefer goes a little bit into why he left the team four years ago and how he's changed his job each year since:

https://youtu.be/a7cJHTpW4Tg (jump to 49:00 or so for the more relevant bits)

Note also that he had a quarter century of experience before Apple, having worked on anything from the (RotJ?) Darth Vader helmet to the Oral B CrossAction, which is, a bit surprisingly, the product he thinks defines his career.