In recent decades, the number of school resource officers has exploded. In 2013, about 30 percent of schools had one, as compared to 1 percent in 1975, The New York Times reported in 2018. These officers have increasingly received attention in the wake of high-profile school shootings. Yet relatively little is known about them. Who are they? How do they see their roles in schools? What kind of training have they received? In the spring of 2018, the Education Week Research Center set out to answer these and other questions by surveying this relatively unknown group. The results are detailed in this report. Survey areas include the following: (1) School Resource Officers and Their Employers; (2) Roles and Duties; (3) Challenges and Morale; and (4) School Shootings.