In July, Fidji Simo announced she would step down from her role as OpenAI’s CEO of applications and transition to a part-time advisor role. Simo, who was diagnosed with postural tachycardia syndrome, or POTS, in 2019, initially took medical leave in April.

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“Over the last seven years, I’ve spent countless hours in doctors’ offices, dealing with symptoms, treatments, insurance, uncertainty, and all the invisible work that comes with being a patient,” Simo wrote on X in July. “Like millions of others living with chronic illness, I’ve experienced firsthand how difficult healthcare can be to navigate, even when you have every possible advantage.”

Simo became the CEO of applications in May 2025.