Is this seriously the society we live in?
- Maybe he's sick
- Maybe a family member is sick
- Maybe he had a kid
- Maybe he's adopting a kid
- Maybe he's burnt out and wants something longer than what is considered a vacation off
- Maybe they're taking a direction on current research he objects to for any number of reasons
- Maybe he has interests in the UK he has to focus on due to Brexit and needs to step away while he deals with them.
- Maybe he's doing something for Partnership on AI that is going to demand most of his time.