Investment by any foreign company in any element of the U.K.'s Critical National Infrastructure should receive careful scrutiny.

As has been the case throughout the history of terrorism, government anxiety centres on what to do about those against whom there may be intelligence but no usable evidence.

Intelligence is fragmentary and hard to discover, so it is by joining forces and sharing information with our allies that we maximise our ability to protect ourselves.

Since 1955, the U.K. has been part of an intelligence-sharing arrangement with the U.S., Canada, Australia and New Zealand. Intelligence-sharing is, in itself, commonplace.

My experience in government is there is a whole host of unintended consequences you have to think through. I can't un-know that, I find it harder now to offer simple solutions.

And that's the mission of The Innocence Project in New York, is to exonerate people who have been wrongfully convicted, and also work from a policy angle with Congress and state legislatures to prevent future wrongful convictions.

My role at Lockheed Martin puts me in contact with extraordinary leaders in many fields - from science and engineering to philanthropy and government. And since we also work closely with our nation's armed forces, we tend to reflect a lot on leadership and how we can inspire successful teamwork, cooperation, and partnerships.

I've often said that there's no one thing that I do or have done that is particularly unique. There have been a lot of other authors who were in the military. There have been a few others who were pilots. There have certainly been a lot of other people who were in politics or served congressional staffs.