I would venture to guess Tom. I certainly don't know for sure, but he has a wife (don't know about PJ's marital status) who is herself a founder/CEO and wouldn't raise eyebrows spending time working at the Github offices.
Is that a coincidence:
https://twitter.com/tpdubs2/status/444509011522891776
Just last Friday his wife's startup is accepted to Techstars NYC, and she is going to be at NYC. It may be a good timing for Tom to take a leave to be with his wife.
Just guessing here. I could totally be wrong. No offense to Tom; I looked up to him.
Tom is married. Is PJ?
Any guess?