Robert S. Lynd was an American sociologist known for his influential work in the field of sociology during the early to mid-20th century. He is best recognized for his studies on community and social change, particularly through his research in the town of Muncie, Indiana. His book, Middletown: A Study in Modern American Culture, co-authored with his wife, Helen Merrell Lynd, provided valuable insights into American life and social structures. Lynd's contributions extended beyond his research; he was also a prominent educator and served as a professor at Columbia University. His work emphasized the importance of understanding social dynamics and the impact of industrialization on communities, making him a key figure in the development of modern sociology.