Fred Wilson started as an associate and then became a General Partner at Euclid Partners. He worked at Euclid Partners from 1987 to 1996.In 1996 Wilson and Jerry Colonna founded Flatiron Partners, which was named after the Flatiron District. Based in New York City, it grew into an investment fund that focused primarily on follow-on investing, with investments in notable dot-com bubble successes and failures, including Alacra, comScore Networks, Yoyodyne, Geocities, Kozmo.com, New York Times Digital, PlanetOut, Return Path, Scout electromedia, Standard Media International, Starmedia, and VitaminShoppe.com. The firm’s 1996 fund capitalized at $150 million with two investors: SOFTBANK Technology Ventures and Chase Capital Partners, the private-equity arm of Chase Manhattan Corp. The firm later raised another fund capitalized at $500 million with Chase Capital Partners as the sole active LP. In 2001 Wilson and Colonna shut down Flatiron. Prior to cofounding Flatiron, he was at Euclid Partners.In 2004 Wilson and Brad Burnham founded Union Square Ventures and have since invested in companies such as Twitter, Tumblr, Foursquare, Bug Labs, Meetup, Zynga, Covestor, del.icio.us, Etsy, FeedBurner, Heyzap, Indeed.com, Tacoda, Oddcast, Disqus, Zemanta, and Clickable.