A lot of people get home from work and sink into a good chair, the place in their life where they feel most comfortable. I get that comfort in space, the place where I most feel like I belong.

The things I like to do involve a lot of mental focus, a combination of physical and mental challenge. That is what mountain climbing is.

As soon as I could ride a bike... I was always riding over to the Museum of Science and Industry to explore. It's where I first began to develop a fascination with machines and scientific principles.

John M. Grunsfeld Quotes