Jeffrey S. Markowitz, DrPH, is an epidemiologist who has authored three books, Pigskin Crossroads: The Epidemiology of Concussions in the National Football League (NFL), 2010-2012 (2013), Lost Seasons: Arrests, Suspensions, Career Chaos, and Mortality Among National Football League (NFL) Players (2016), and Mortality and Its Risk Factors Among Professional Athletes: A Comparison Between Former NBA and NFL Players (Springer, 2018). From 1983 to 1992, Dr. Markowitz was an adjunct assistant professor of Public Health at the School of Public Health at Columbia University in New York, NY, USA.