Bruce Ratner has led an eclectic life. After focusing much of his undergraduate coursework on math, biology, and physics, he started his career in law and public service as an assistant professor at New York University Law School and Commissioner of Consumer Affairs under Mayor Ed Koch. In his late 30s, he moved into real estate, becoming one of the city’s largest developers. In 2016, Ratner’s brother, Michael, died of metastatic cancer. Through this tragedy, Ratner came to realize that early detection was the key to reducing cancer mortality. Following his brother’s death, he founded a non-profit, the Michael D. Ratner Center for Early Detection of Cancer, to research and promote better cancer screening. He is on the boards of Memorial Sloan Kettering Cancer Center, Weill Cornell Medical Center, and the Cold Spring Harbor Laboratory.