After a five-year stint at NASA, Chris Kemp is stepping down as the space agency’s chief technology officer. In a blog post Monday, Kemp said “deciding to leave NASA has not been easy, and is something I’ve been struggling with for the past few months.” About a month ago, I mentioned to one of my mentors that “it’s a very difficult time to be an entrepreneur at NASA.” She responded “is it ever a good time to be an entrepreneur at NASA?” Reflecting on this, I realized that most of my accomplishments at NASA were not at Headquarters, but out…