He served as chairman and CEO of VeriSign Inc., a security services and network infrastructure company, from 1995 to 2007, leading the company for over a decade as VeriSign grew into a NASDAQ-traded corporation with over 5,000 employees, $1.7 billion in annual revenues and a market value of over $25 billion. As a recognized expert in internet security and telecommunications infrastructure, he sat on the President of the United States' National Security Telecommunications Advisory Committee and was a senior advisor to the Director of National Intelligence.