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Networking Tech Inventor Casado Leaves VMware for Andreessen

  • Executive ran one of VMware's fastest-growing businesses
  • Company has been hit by turmoil since Dell deal for EMC

Martin Casado, the head of one of VMware Inc.’s fastest-growing businesses and the father of a networking technology that’s upending the industry, is leaving to join venture capital firm Andreessen Horowitz.

Casado’s work as a graduate student at Stanford University pioneered the idea of using software rather than hardware to control networks. The technology has challenged Cisco Systems Inc.’s grip on the market and has made it easier for engineers to build, manage and upgrade networks using cheaper, off-the-shelf equipment.