Justin Waldron is a Founding Contributor of Open Game Protocol (formerly gemz), which enables play-to-earn for any token, in any game, anywhere. He also serves as the co-founder and president of Playco, an advisor at Shibuya Startup Support, which is an initiative of the Shibuya City Office, and a partner at X&KSK, where he invests in promising Japanese startups poised for global expansion. A prolific angel investor with a portfolio exceeding 60 companies, he is best known as the co-founder of Zynga. In 2021, Business Insider recognized him as one of the Top 100 Seed Investors.