Seth is the co-founder and CEO of Crossfader, the iPhone app that makes it easy for anybody to DJ. In 2011, Seth co-founded Turntable.fm, which enabled people to listen to music together online. Over the past twenty years, Seth has started and invested in a number of companies that pioneered the use of the Internet in their industries, including SiteSpecific which created some of the first online advertising campaigns in 1995, Majestic Research which he started in 2003 and tracked online consumer behavior to provide investment research to hedge funds , and the non-profit Attention Trust which began advocating in 2005 for the rights of Internet users to own a copy of their own browsing data. Seth is an angel investor in a number of startups, including the social payment system gumroad and the cloud-based music collaboration service splice. In recent years, he has worked with the US State Dept’s to foster entrepreneurship in the emerging markets of Egypt, Turkey and Greece. You can follow @seth on Twitter and read his blog on Medium. He lives in SF.