Anthropic Long-Term Benefit Trust — key-event: Paul Christiano departs as trustee

NoteThe source directly confirms both key elements of the claim: (1) Paul Christiano departed as trustee from the Anthropic Long-Term Benefit Trust, and (2) this occurred in April 2024 (matching the 'as of 2024-04' timeframe), and (3) he left to become Head of AI Safety at the U.S. AI Safety Institute. The information appears in the footnotes of the source document, which is an official Anthropic announcement about the LTBT.