Position: Vice president, government relations, Lucent Technologies, which designs and delivers systems, services and software for communication networks.

Career Highlights: Director, National Communications System; manager, critical infrastructure protection programs, Sandia National Laboratories; vice president, electronic commerce, CAMP Inc.; commissioner, President's Commission on Critical Infrastructure Protection, White House; commanding officer on two nuclear fast attack submarines, U.S. Navy.

Age: 55

Education: BS, foreign affairs, U.S. Naval Academy. Greene is a retired U.S. Navy captain.

Personal: Lives in Annapolis with wife Debbie and their sons, Andrew, 13, and Adam, 9.

How did you get where you are today?

I've got national security in my blood -- going through the Naval Academy and driving nuclear submarines during the height of the Cold War. That involved working with a lot of advance technology issues late in my career. Then I left government to join the private sector. And I was eventually asked to come back and lead the Department of Homeland Security's National Communications System. While there, we did a significant range of things like playing a major role in partnering with the industry to restore communications in New York following the attacks on Sept. 11, 2001.

I had two significant mentors. One was Adm. Ralph Tindal, who had great management and leadership skills. The other was Adm. Bill Owens, who had a significant appreciation for how we can advance technology to support what we need to do.

I'm constantly striving to find ways to do things. And I guess I'm passionate and enthusiastic about everything I do.

Challenges? I guess finding ways to do things when the accepted mindset is that you can't make that happen. When we started pointing out how vitally important critical infrastructure was, within four years we took that from a concept to causing a president's commission to be put in place to investigate it. That's an example of recognizing what we thought was the right direction for our country and executing a path to cause important national initiatives to happen.

The lesson is you have to hunt for ways to make things happen. You also need to treat people well because you can't do anything without building a team. And collaboration is a very vital skill to achieve what you want to achieve.

-- Judith Mbuya