A smart and quirky industry leader, Glenn Kelman is president and CEO of Redfin. Kelman’s web-based brokerage operates a little differently than his competitors, paying its agents on salary instead of commission and offering homebuyers rebates after purchasing. Although Kelman’s full-time agents get much of the attention, Redfin is a leading provider in technology for the entire homebuying process, and its blog is full of valuable real estate data and market studies.