OpenAI Applications Chief Fidji Simo Steps Down to Part-Time Role Over Chronic Illness Recovery

Fidji Simo's transition from full-time president of applications to part-time advisor represents a significant leadership adjustment at OpenAI, occurring less than two years after her appointment to the newly created role in May 2025. Her medical leave in April and subsequent step-down highlight the extended nature of her chronic illness recovery—a condition she has managed for seven years but which required a severe exacerbation to force a change in her work arrangement. Simo's candid reflection that she "failed to make this decision many times before" suggests the organizational and personal pressures that can delay necessary health-focused choices, even in a company with resources to support medical leave (she referenced Meta's earlier offer of a full year off).

The departure occurs within a broader pattern of senior attrition at OpenAI in 2025, including the departure of the head of private equity to Google and a sales leader to Thrive Capital. During Simo's absence, the company reorganized leadership responsibilities, with Brockman, Lightcap, and Dresser assuming new or expanded roles. Simo's continued involvement in disease-cure initiatives through Chronicle BioAI and CODA Research suggests that her commitment to health-related work persists even as her executive responsibilities scale back, aligning her stepped role with her stated priorities.