[YouTube] Chad was also lucky to meet his future wife, Kathy Clark, at a party in 2000. Clark shared his interest in technology and in starting a family. She also turned out to be the daughter of James Clark, the legendary Silicon Valley entrepreneur who founded or co-founded three billion-dollar-plus companies: Silicon Graphics, Netscape and Healtheon. His daughter, 36, is an intensely private person … She asked that I not reveal the names of the kids. Kathy and Chad have never before publicly discussed her father’s identity. Their reluctance is understandable: Jim Clark is one of the valley’s most revered figures, and because he runs a media-sharing websiteâ€”Shutterfly, founded in 1999â€”it would be tempting to think he was the real force behind the video-sharing site his son-in-law was starting.