Sheri R. Levy, PhD is an Associate Professor in the Department of Psychology at Stony Brook University, USA.  She studies factors that cause and maintain prejudice, stigmatization, and negative intergroup relations and that can be harnessed to reduce bias, marginalization, and discrimination. Her research focuses on bias based on age, ethnicity, gender, nationality, race, sexual orientation, social class, and weight.  Levy was Editor of Journal of Social Issues from 2010-2013.  Jamie L. Macdonald is a graduate student in the Department of Psychology at Stony Brook University, USA. She studies prejudice, stereotyping, discrimination and intergroup relations. Her research focuses on ageism, and how it affects individuals in different contexts throughout the life course. Todd D. Nelson, PhD is a professor of psychology at California State University – Stanislaus. His research focuses on stereotypes and prejudice, and on ageism in particular. He is a fellow of the Society for Experimental Social Psychology, and has published extensively on ageism.