#11. Marc Benioff—Salesforce
First job: Founded Liberty SoftwareThe founder and CEO of Salesforce continues to advance his goal of revamping the software business by moving everything to the cloud. A chief proponent of software as a service, Benioff is credited with driving his industry in new directions and changing perceptions. His first job was as the founder of Liberty Software at age 15. The company made games for the Atari 8-bit system.