Personnel: Tom Brown at Anthropic (Co-founder)

Note: While the source is from Anthropic's official company page and discusses the organization, it does not mention Tom Brown at all, nor does it provide a list of co-founders or founding team members. The only personnel information provided is the Board of Directors and LTBT Trustees. The absence of Tom Brown from this governance section does not contradict the claim (he may have been a co-founder but not currently on the board), but the source does not confirm the specific claim about Tom Brown being a co-founder or his start date of 2021-01. This is therefore unverifiable based on the provided source text.