Johnnie Kallas is a Ph.D. candidate in labor relations at Cornell University’s School of Industrial and Labor Relations. His research explores the changing nature of labor organizing in the United States, with a particular focus on the conditions under which strikes are most effective for workers and their organizations. The main chapter of his dissertation examines strikes and strike outcomes by healthcare workers. He also serves as project director of the ILR Labor Action Tracker, an online database that seeks to overcome limitations in official sources by comprehensively documenting strike activity across the United States. Kallas received his B.A. in politics and history from Oberlin College.