I was lucky enough to work with Mark in building our Agile Unit Testing, TDD, and refactoring community. It grew in size to over 400. Not only does Mark have keen technical skills, a gift for explaining topics, Agile in his DNA, but what sets him apart is his ability to grasp and drive towards the right strategic direction. He was so key to our Agile/TDD group Some folks with Mark's insight and intelligence are hard to communicate with. Not so in his case. He's great to get along with, and speaks well. The good thing about working for a large company for 25 years is you meet a lot of smart people. That gives me the perspective to know that Mark was one of the best. I'm sure anyone who gets to connect with him will be benefit right away.