Photo by Francis Zera Photography [enlarge] UMC was the mechanical contractor for Amazon’s Day 1 Building (right), Doppler Building (left) and Spheres (in between). This campus has Seattle’s first large-scale district energy system. Jerry Bush last month shed his role as president of UMC as part of a succession plan put into play nearly a decade ago that calls for longtime employee Steve Brooks to take over. Bush was the mechanical contractor's president and CEO for 20 years, and is continuing as CEO through the end of the year. After that, he will stay on to help the century-old company with strategic projects and initiatives.