Ronan Quinlan turned 50 last November.  To celebrate, he hired a Winnebago and set off on a road trip across the United States with a few friends. In addition to his birthday, Quinlan had other things to celebrate, and to reflect upon. Two years before, Quinlan sold his stake in Taoglas, a provider of antennas, advanced IoT components, and custom design services that are sold around the world.  Quinlan had co-founded the business two decades before, but sold his holding when Graham Partners took a majority stake in a deal that valued Taoglas at more than $200 million. Since then,…