Mark Zuckerberg's father is a dentist in Dobbs Ferry, N.Y., whose practice can be found on the web at painlessdrz.com. In 2009, he was given 2 million shares of Class B Facebook stock. The shares were given to the elder Zuckerberg as a thank you for providing some “initial capital” to get the company off the ground. According to a 2011 Los Angeles Times profile, Dr. Zuckerberg was an early adopter of computer technology – he bought the first computer for his dental practice in 1984, the same year Mark was born. The younger Zuckerberg also received his first programming lessons from Edward, on the family’s Atari 800.

Paul Sakuma/AP/File
In this 2007 file photo, Facebook CEO Mark Zuckerberg poses at his office in Palo Alto, Calif. Zuckerberg's father, a dentist, owns an estimated 2 million shares of Facebook stock and will be worth a huge amount of money when the IPO is launched.