During the course of my conversation with veteran entrepreneur Steve Blank, he described himself as the "busiest retired man you've ever seen." That's a fair assessment. Blank is a prolific blogger and a teacher and lecturer at universities like Berkeley and Columbia. He also works with organizations like the National Institutes of Health and the National Science Foundation to, in his words, "commercialize science" and innovation across the country. Sounds like a busy schedule, but Blank is used to this lifestyle.