The back-to-school season is here, and as parents take their children to shop for school supplies, I suspect that many of them will be visiting a Staples store. I'm very familiar with those stores because Staples is one of many businesses we helped create and expand at Bain Capital, a firm that my colleagues and I built. The firm succeeded by growing and fixing companies.

The lessons I learned over my 15 years at Bain Capital were valuable in helping me turn around the 2002 Winter Olympics in Salt Lake City. They also helped...