OpenAI's number two executive, Fidji Simo, said she is quitting after just a year over a flare-up of POTS, a neuroimmune condition she has suffered from since 2019. Two years after her diagnosis, she had refused a year-long medical leave offered by her then-employer, Facebook. "[Mark] Zuckerberg told me I should play the long game. I wish I'd listened," she said.