25. Nikesh Arora
Palo Alto Networks
Arora has charted a course of aggressive growth for the world’s largest pure-play cybersecurity vendor with eight acquisitions over his first two years as CEO. Arora’s pursuit of best-of-breed startups like Demisto, CloudGenix and Twistlock has allowed Palo Alto Networks to establish a leadership stance in newer areas like SD-WAN, container security and Security Orchestration, Automation and Response.