William G. Bowen is President of The Andrew W. Mellon Foundation and former President of Princeton University. He is coauthor of The Shape of the River and The Game of Life (both Princeton). A former All-American collegiate athlete, Sarah A. Levin is a doctoral student at the Harvard School of Public Health and a research associate at The Andrew W. Mellon Foundation. She completed her undergraduate work in mathematics at Harvard, where she was an All-American collegiate athlete.