A serial entrepreneur, Koch co-created Orca Interactive in 1995 with Haggai Barel. Orca Interactive went on to become the leader in Internet Protocol TV content management and was named one of Oracles "top 50 solutions worldwide". Orca was later sold to Emblaze Systems and then acquired by France Telecom. Dotomi, Koch's next venture, provided a single source for direct marketing solutions, including online targeting, analytics and data/media management. Dotomi was acquired by ValueClick.

Koch’s latest venture, TriPlay, is a consumer cloud services company that enables users to seamlessly sync, access and store their media anywhere, on any device. TriPlay recently acquired eMusic.com, the original download-to-own digital music store, and is now focused on fixing a broken music industry by building a fair, simple and transparent music distribution platform for independent artists and service providers.