Prior to TippingPoint, Mr. Hamilton was most recently President and Chief Executive Officer of Efficient Networks, Inc., a subsidiary of Siemens AG. Prior to Efficient Networks' acquisition by Siemens in April 2001, he served as Executive Vice President of Worldwide Sales and Marketing as well as General Manager of the company's four products divisions from 1999 to 2001. Prior to Efficient Networks, Mr. Hamilton served as Vice President of Worldwide Sales and Service for Picazo Communications, Inc., an IP telephony company sold to Intel Corporation in late 1999. He has previous experience as Director of the Communications Products Group at Compaq Computer Corporation, Vice President of Sales at NetWorth, Inc., which was sold to Compaq in 1995, and managed the North American reseller channel at 3Com Corporation.