Sarah Milstein, co-host of The Lean Startup Conference, is also co-author, with Tim O'Reilly, of The Twitter Book and a frequent speaker on business and technology. From 2009 through 2011, she ran the Web 2.0 events for UBM TechWeb, in conjunction with O'Reilly Media, and was co-chair of the influential Web 2.0 Expo. Previously, she was on the senior editorial staff at O'Reilly Media, where she founded Tools of Change for Publishing (TOC) and led development of the Missing Manuals. Before joining O'Reilly in 2003, Sarah was a freelance writer and editor, and a regular contributor to The New York Times. She was also the CSA program founder for Just Food, a local-food-and-farms non-profit, and co-founder of Two Tomatoes Records, a label that distributes and promotes the work of children's musician Laurie Berkner. She holds a B.A. from Rutgers University and an M.B.A. from U.C. Berkeley's Haas School of Business. Bonus fact: she was the 21st user of Twitter.