Best known for his TV roles on Alias, Lost, and Felicity, Greg Grunberg is also a devoted father of three and a tireless activist. He is the celebrity face behind the Pediatric Epilepsy Foundation, which strives to find a cure for this disease that affects millions of kids--including his son Jake. Greg told us about his fundraising efforts, his new TV gig, and sleeping through his first commercial audition.

You left the role of a CIA agent on the hugely popular Alias to begin another new TV series. How come?