Zak Ringelstein began his career as a 4th grade teacher and now is the CEO of one of the fastest growing edtech companies, Zigazoo. Before founding Zigazoo, Ringelstein exited his first company, UClass, to Renaissance Learning (Google Capital company, owned by Hellman & Friedman). Zigazoo is already a top 200 app just a few months after launch and recently raised capital from MaC Venture Capital, Serena Ventures, Talis Capital, Jimmy Kimmel, and other Hollywood heavyweights. Zigazoo hosts kid-friendly challenges from brands and talent such as Apple TV+, Netflix, Peanuts, the Philadelphia Zoo, and Serena Williams' doll Qai Qai. TechCrunch calls Zigazoo the "TikTok for Kids" and CNN says Zigazoo is the “example of how to offer a social yet safe place for children to be online."