Kevin Brennan spent six years of his life helping to build a business with a partner. Then he left. It was a high-wire decision, but one he could not shy away from. He and his business partner had a serious falling out over the company, a plumbing contractor in Will County, Ill., outside Chicago.“We had two different ideas about where the business should go,” Brennan says. “I believed in diversification, and my partner didn’t. I walked away, left him with a client list, left him with all the tools and material, stock, advertising — the whole nine yards.” He had
