He does have to travel to meet with clients, but from what I've gathered, it is not particularly frequent. He had a pretty solid resume as an engineer and is definitely one of the most creative, smart people I know, but I don't think that he had much of a list of prior clients. As I recall, our school kind of set him up with his 2 main clients. Its quite a bold move on his part and inspiring to me. It's only one data point, but its certainly an example of how its possible to carve out a niche.