At age 29, Jepsen found herself suffering from blistering headaches, confined to a wheelchair, and sleeping 20 hours a day. She was just about to drop out of school when an MRI revealed a tumor on her pituitary, a small gland at the base of the brain central to hormone production. She underwent surgery to have the tumor removed and emerged from the ordeal ready to move on with her life. “There’s a stigma when you undergo brain surgery: are you still smart or not? So afterwards I tried to challenge myself to find out.” She finished her Ph.D. in the next six months and then cofounded MicroDisplay, a Fremont, Calif.–based company that manufactures liquid-crystal-on-silicon chips for high-definition TV displays. She left MicroDisplay in 2003, citing “creative differences” with its chief executive, but within days Intel was recruiting her.
Her health problems weren’t quite over, though. As a result of the operation, Jepsen’s body now makes no hormones, requiring a rigid schedule of twice-daily hormone supplements to keep her alive. Now that she’s a globe-trotting computer executive for the OLPC venture, the regimen can be tough to follow; last March she went into adrenal shock on board a plane, forcing it to make an emergency landing. (On the bright side, Jepsen reports that as a result of her hormone deficiency, she is unaffected by jet lag.)
That's Mary Lou Jepson, CTO of the 'One Laptop Per Child' (OLPC) project.