Since 1993, I have founded startups in the New York area, including Interactive Imaginations, Inc, and 24/7 Real Media, Inc. I was an internet advertising pioneer, having created one of the first advertising networks in 1995, as well as the very first interstitial and demographically targeted internet ads.

In 2002, I founded Slooh.com, a worldwide community of people peering into space together. I hold patent US 7,194,146 B2, a method for computer image processing of telescope-received camera images of celestial objects. In 2007 I founded StartupExchange, where founders of venture-backed startups can pool equity to diversify their equity holdings