4. Martin Casado
Chief Architect of Networking, VMware
Casado joined VMware last year when it acquired Nicira, the much-buzzed-about network virtualization startup Casado co-founded, for $1.2 billion. Casado now plays a pivotal role in VMware's vision for next-generation data centers, leading VMware's charge into software-defined networking and recently launching the NSX network virtualization software.