The PartsSource founder built a career finding value in overlooked places. His most revealing calculation was how much of a company’s success belonged to the people doing the work.

Before he sold the promise of healthcare software, Guy Mansueto helped install it. That operator's education became the quiet advantage behind a career spanning Allscripts, Phytel, IBM Watson Health, Bamboo Health and PartsSource.

His career is a study in the unglamorous work that makes ambitious technology usable: translate the science, earn trust, fit the workflow, and give the team a next step by Monday.