Kevin Roose
This guy has worked at Meta, OpenAI, Thinking Machines, Meta again, and now Anthropic within the span of a couple of years. I can only assume he is doing some sort of Pokemon style speedrun. I love it and I hope he changes jobs 5 more times before the singularity.
Meghan Bobrowsky
Update: Andrew Tulloch is joining Anthropic, according to a person familiar with the situation.