Early in 1992 I went to the London headquarters of J.P. Morgan, which at that time was housed in a converted school building. I felt as if I were being called into the headmaster’s office. I was there to see WPP’s bankers, and they weren’t happy. Two years earlier we’d borrowed to make a giant acquisition; soon afterward, a global recession hit, and we struggled to make our debt payments. I had to meet with the bankers each quarter; they’d go over all our expenses and question our approach. Out of that near-death experience was born the strategy that has driven our growth for the past 25 years.

A version of this article appeared in the July–August 2016 issue (pp.33–36) of Harvard Business Review.