Mr. Andy Sack serves as Managing Director & Mentor at Techstars. Mr. Andy Sack co-founded and served as Executive Chairman at Lighter Capital. He also serves as Venture Partner at Founders' Co-op. He also serves as Managing Member at Founder's Co-Op Management II. He is a Board Member at MightySignal and Influence Mobile. He was a Board Member at Haiku Deck. Prior to founding Judy's Book in 2004, he co-founded three successful Internet technology companies: Kefta, a provider of real-time customer interaction solutions (acquired in 2007 by Axciom); Abuzz, an enterprises knowledge management solution (acquired by New York Times Digital in 1999) and Firefly Network, an Internet company that pioneered internet personalization technologies (acquired by Microsoft in 1997). He is an Advisor of including Zango, Cooler Planet and Orange Line Media. He received his undergraduate degree from Brown University in 1990 and his MBA from the Sloan School of Management at MIT. He is also an Angel Investor.