Overview
- Zifan Wang said his O‑1 visa stamp for re‑entry was denied after visiting family in China, blocking his immediate return to the United States.
- The Meta research scientist, who holds a PhD from Carnegie Mellon University and spent about seven years in the U.S., announced he is moving from San Francisco to London to continue AI and AI‑safety work.
- Wang did not disclose an official reason for the denial in his social media posts, and news coverage has not reported a specific administrative explanation.
- Colleagues and other researchers publicly offered support and opportunities in London, while online commentary described the episode as a loss of talent for the United States.
- Outlets citing the Associated Press placed the development within recent U.S. immigration actions, including a pause in immigrant visa processing for some nationalities and efforts to restrict entry based on security and public‑benefit concerns.