For four decades, Susan Meiselas' name has been synonymous with photographs that are raw, unnerving, illuminating, and transportive. In the 1970s, Meiselas established her career with an in-depth study of carnival strippers in small-town America. In the early 1980s, Meiselas documented harrowing events in El Salvador, where army-backed death squads killed thousands of civilians and insurgents. In the 1990s, Meiselas went to Kurdish areas of the Middle East, spotlighting a people hemmed in by geography, history, and war. Meiselas continues to crisscross the world, and continues to win such awards as a MacArthur grant and the Cornell Capa Infinity Award for lifetime achievement. Meiselas is one of the key participants in a daylong "Bearing Witness" symposium that explores how the new culture of photography, where camera phones are everywhere, has changed photography's role to both document and influence society. Other participants in the symposium, which is organized by SFMOMA, include Instagram co-founder Mike Krieger; Kathy Ryan, director of photography for The New York Times Magazine; and Pete Brook, editor of prisonphotgraphy.org.