Sarah Milstein is a Senior Director of Engineering at Mailchimp. Previous roles include Head of Sales & Marketing for 18F.gov; VP of Programs for indie.vc; CEO and co-founder of Lean Startup Productions; and co-author of The Twitter Book. She's also held senior management positions at O’Reilly Media, UBM TechWeb, and several startups. Earlier, she was a freelance journalist writing regularly for The New York Times, she co-founded a record label with children’s musician Laurie Berkner, and she started Just Food's CSA program. She holds an MBA from UC Berkeley and a BA from Rutgers University. Bonus fact: She was the 21st user of Twitter.