Holden Karnofsky — Notable For: Co-founder of GiveWell and Open Philanthropy; influential figure in effective altruism; author of 'Most Important Century' blog series on transformative AI

NoteThe source confirms two of three elements: (1) Co-founder of GiveWell—confirmed ('co-founded the charity evaluator GiveWell with Elie Hassenfeld in 2007'); (2) Co-founder of Open Philanthropy—confirmed ('co-founded in 2014 the grantmaking organization Open Philanthropy'); (3) Influential figure in effective altruism—confirmed ('Karnofsky identifies with the ideas of effective altruism and has both represented and engaged with the effective altruist community'). However, the source does not mention the 'Most Important Century' blog series on transformative AI. The Wikipedia article does reference his blog 'Cold Takes' in the External links section, but does not describe it as a 'Most Important Century' series or specifically about transformative AI. This omission makes the claim partially unverifiable from this source.