I'm specifically wondering about people who played a pivotal role in their success, especially early on.
- Peter Thiel was crucial for Mark Zuckerberg (Facebook) - Ray Chambers for Jack Dorsey (Twitter) - Ken Allard and investors Ben Horowitz for Dennis Crowley (Foursquare) - Paul Graham and Partovi Brothersfor Drew Houston and Arash Ferdowsi (Dropbox founders) - Adam D'Angelo for Kevin Systrom (Instagram)
See more of who mentored whom at http://www.businessinsider.com/meet-the-mentors-behind-the-visionaries-of-tech-2012-7?op=1