Before becoming a venture investor, Andy Sack co-founded and sold multiple companies, including Firefly Network to Microsoft, Abuzz to NYT Digital, and Kefta to Acxiom, and he continued founding startups even during stints as an entrepreneur-in-residence at Softbank Venture Capital. Alongside his investing work at Founders' Co-op, he helped build Seattle's startup scene through roles at TechStars Seattle and Code Fellows, and he backed revenue-based funding through Lighter Capital rather than only traditional equity investing.