Canadian mathematician Jacob Tsimerman, a newly awarded Fields Medalist, is leaving his position at the University of Toronto to join OpenAI. Tsimerman has previously published research on the potential risks of AI, including scenarios where AI could contribute to human extinction. He is now set to work on AI safety at OpenAI. Tsimerman's move highlights the growing importance of addressing potential risks associated with advanced artificial intelligence. This development matters because it underscores the need for experts in AI safety to be working directly with leading AI companies.