Forbes Magazine’s January’s edition features 30 under 30 business prodigies. Sam Altman, at age 29, a St. Louis native and Captain Elementary School graduate is featured at the top of the venture capitalist list. Altman graduated from John Burroughs High School and attended Stanford University.

In a recent interview with Forbes, Altman explains that his best mistake was to drop out of college. After leaving Stanford where he studied computer science, he went on to start his own company, called Loopt. Loopt is an application that produces mobile location-based services, and connects people to their community. The application helps users find the location of the peers.

Loopt was initially funded by Y Combinator, which provides seed funding and support for start-ups. Seed funding is the earliest stage of venture funding helping entrepreneurs launch their business plan. When Loopt became a major success, Altman sold the company for over $43 million dollars to Green Dot.

Y Combinator has funded and coached more than 700 start-ups in the last 10 years. Dropbox, Scribd, Reddit, Airbnb, Disqus, Stripe are a few of the well known and respected companies Y-combinator has funded. Over 30 of the companies funded by Y combinator are worth over 100 million dollars. When the president of Y Combinator’s, Paul Graham resigned in 2014, he personally hand-picked Altman to lead the company.

Since Altman got his new position, he has been working vigorously. He has big plans to expand the company over the next decade.

Just under 30 years old and a college dropout, Altman has taught an entrepreneurship class at Stanford, sold his startup, and runs a company worth over 30 billion dollars.