They're all cofounders of Anthropic. Dario is the CEO, Jared leads research, and Sam leads infra. Both Jared and Sam were the "responsible scaling officer", meaning they were responsible for Anthropic meeting the obligations of its commitments to building safeguards.
I think neom is referring to Jack Clark, another one of the seven cofounders.
FWIW, I agree strongly w/ lebovic's toplevel take above, that Anthropic's leaders are guided by their values. Many of the responses are roughly saying, "That can't be true, because Anthropic's values aren't my values!" This misses the point completely, and I'm astounded that so many commenters are making such a basic error of mentalization.
For my part, I'm skeptical of a lot of Anthropic's values as I perceive them. I find a lot of the AI mysticism silly or even harmful, and many of my comments on this site reflect that. Also, like any real-world company, Anthropic has values that are, shall we say, compatible with surviving under capitalism -- even permitting them to steal a boatload of IP when they scanned those books!
Nonetheless, I can clearly see that it's a company that tries to stand by what it believes, and in the case of this spat with Dep't of War, I happen to agree with them.
It would be better if people could name them with their full names to avoid any confusion.