A few years ago, I was interviewing a candidate for a substantial position in our firm. Although the candidate and I had exchanged a number of emails, this was our first meeting. We got along very well. Then something unexpected happened: She looked me in the eye and said that she struggled with “mental illness.” She added that she’d been on meds for more than a decade, and that there had been no episode during that time. But she wanted me to hear about her condition directly from her, in case I had any questions.