How the suicide of a Blackstone unit CEO shows the difficulties of doing well and doing good.

Bruce Wrobel’s body was found by a friend on Dec. 10, 2013, at about 1 a.m. in a Mercedes-Benz CLK550. Police called to the West 20th Street scene—a quiet, tree-lined stretch of townhouses in Manhattan’s affluent Chelsea neighborhood—discovered suicide notes to family and friends. The New York City medical examiner concluded the 56-year-old poisoned himself inside the parked car with carbon monoxide by mixing sulfuric acid and other toxic chemicals.

Colleagues and friends were shocked and heartbroken. Why would Wrobel, a visionary businessman who succeeded through a forceful blend of hard work and passion, kill himself at the peak of his career?