https://en.wikipedia.org/wiki/Jawed_Karim
After co-founding the company and developing the YouTube concept and website with Chad Hurley and Steve Chen, Karim enrolled as a graduate student in computer science at Stanford University while acting as an adviser to YouTube. When the site was introduced in February 2005, Karim agreed not to be an employee and simply be an informal adviser, and that he was focusing on his studies.[7] As a result, he took a much lower share in the company compared to Hurley and Chen.[18]
Because of his smaller role in the company, Karim was mostly unknown to the public as the third founder until YouTube was acquired by Google in 2006. Despite his lower share in the company, the purchase was still large enough that he received 137,443 shares of stock, worth about $64 million based on Google's closing stock price at the time.[19]