Lilian Weng, a co-founder of AI research firm Thinking Machines, has departed the company due to health reasons. Following her departure, Weng has joined OpenAI, where she previously held the role of Vice President of AI Safety Research. The exact circumstances of her departure and the nature of her health reasons are not specified. The move highlights the ongoing challenges faced by AI researchers and the importance of prioritizing their well-being. This development matters because it underscores the need for responsible leadership and support within the AI industry.