He previously served as the Chairman of the Board of Directors and as Chief Executive Officer since its inception in December 1999. Previously, Zack co-founded and ultimately served as President and Chief Executive Officer of NetDynamics, Inc., an application software company, before its acquisition by Sun Microsystems in 1998, when he served as the Vice President and General Manager of the NetDynamics business unit. From 2005 to 2012, he also served on the Board of Directors of Conduit Ltd., a provider of cloud-based solutions for web publishers, as well as the Chairman of the Board of Directors from 2005 to 2011. Previously, Zack held senior management positions in operations, marketing, and engineering at Silicon Graphics, Inc., and at Advanced Technology Israel. He holds an MBA from Harvard Business School and a BA in computer science from the Technion (Israel Institute of Technology).