Late on a Friday in November 2013 I was at a strategy offsite when my executive assistant texted that we had received a package by courier from the U.S. Food and Drug Administration. At the time, 23andMe had been in a years-long back-and-forth with the FDA over how we should be regulated, so this news made me anxious. Hoping to gain as much time as possible, I texted back, “Don’t sign for it!” She replied, “It’s too late, I already did.” As it turned out, that package contained a warning letter that would forever change the course of 23andMe.

A version of this article appeared in the September–October 2020 issue of Harvard Business Review.