Tissue engineering has always had an applied focus and there is hardly an academic publication that does not mention the applicability of its findings to the future development of a medical product. I have been involved in the industry side of tissue engineering from the start, pursuing a variety of applications, some making it to the marketplace. There have been many lessons that I have learned from direct experience (mistakes and successes), observation, through advising others, and now, in developing innovative ways to identify and eliminate the regenerative cell populations within a tumor. This brief overview of some of these lessons is written with the next generation of pioneering product developers in mind: the biologists, biochemists, and engineers who will dedicate their careers to driving medical and commercial progress in tissue engineering.