Spencer Rascoff

Rascoff has made swift progress with Zillow, the online real estate site he joined in 2005 that connects real estate agents, homeowners, mortgage lenders, and others. And with 100 million homes and apartments in its database, it has also become an invaluable tool for economists too. Since he took it public last year, Zillow’s revenue has climbed and membership has soared to 37 million active users. Much of Zillow’s success lies in the smooth — and rapid — user transition from desktop to mobile. Explains Rascoff: “It’s when you’re driving around that having access to real estate information is all that more critical.” All in the family: Rascoff’s 7-year-old daughter is pursuing an entrepreneurial venture of her own, selling perfume online. –J.P.M