In the summer of 2012, while enrolled at Harvard Business School, Dubliner Oisin Hanrahan decided he wasn’t in the right place. That summer he had started a business called Handy with a Harvard classmate, Umang Dua. Their new company had made a promising start. And they knew the business opportunity would probably have passed by the time they had completed the MBA, the following year. So they dropped out and moved to New York to focus full-time on Handy.  Six years later Handy was sold to Angie Home Services for $164 million. Hanrahan has stayed on as Handy’s CEO, and…