David is a frequent guest on TV and radio stations across America and can usually be heard or seen on-the-air at least once a week. He writes weekly commentary and analysis for CNN's Anderson Cooper 360 and has been interviewed by Fox News, CNN, various ABC and NBC affiliates, and Canada's Global TV. He has been a featured guest on National Public Radio and has also been featured on Voice of America, Radio Free Europe, and Radio Liberty where his commentaries on technology, industry, and emerging nations have been broadcast into 46 countries (all in their own unique translations).

According to the Independent Computer Consultants Association, David is "one of America's foremost email experts". He has been described by CNN as "a leading Presidential scholar specializing in White House email" and is best known for his non-partisan national security analysis of the Bush White House email controversy. He is the author of the book Where Have All The Emails Gone? How Something as Seemingly Benign as White House Email Can Have Freaky National Security Consequences, which explores the controversy from a technical perspective and, according to The Intelligence Daily, is "the definitive account about the circumstances that led to the loss of administration emails."

The author of five traditional books and nine digital books, David has written more than 700 articles about technology, competitiveness, and national security policy and has been a guest commentator for the Nieman Watchdog of the Nieman Foundation for Journalism at Harvard University.

He is the Cyberterrorism Advisor for the International Association for Counterterrorism & Security Professionals, a columnist for The Journal of Counterterrorism and Homeland Security and a special contributor to Frontline Security Magazine. He is a member of the FBI's InfraGard program, the security partnership between the FBI and industry. David is also a member of the U.S. Naval Institute and the National Defense Industrial Association, the leading defense industry association promoting national security.

David is an advisory board member for the Technical Communications and Management Certificate program at the University of California, Berkeley extension. He is also a member of the instructional faculty at the University of California, Berkeley extension. David is also a former professor of computer science, has lectured at Princeton, Berkeley, UCLA, and Stanford, has been awarded the prestigious Sigma Xi Research Award in Engineering, and was a candidate for the 2008 Pulitzer Prize in Letters.

Earlier in his career, he was an executive at Symantec Corporation. He also held the unusual title of "Godfather" at Apple Inc. and served on the board of the Software Entrepreneurs Forum (now SDForum) in Santa Clara County, California.

David is the creator of ZENPRESS, a breakthrough technology for Internet magazine production. He is also the lead developer of the MySQL and SQLite database extensions for the open-source Frontier Kernel project and has designed embedded database technology used by more than 2,000 companies, universities, and government agencies. He is also the author of 40 iPhone applications currently published on the Apple iPhone App Store.

An accomplished author and photographer, David is also an entertaining and electrifying speaker. Whether offering insight into technology trends, helping small and large businesses remain competitive in a wildly changing world, providing a broader perspective on policy matters, or helping leaders understand the big technology and security challenges facing citizens throughout the world, David makes complex topics understandable, difficult issues compelling, and challenging concerns actionable and solvable.

Weaving a tapestry of industry, politics, security, and technology, he brings a unique and powerful perspective to all his audiences. Known for their clarity and insight, his articles and radio interviews reach more than a million people worldwide each week.