Irwin Altman is a prominent American psychologist known for his contributions to social psychology and environmental psychology. He was born on March 29, 1930, and has conducted extensive research on topics such as personal space, privacy, and the dynamics of human interaction. His work has significantly influenced how we understand the relationship between individuals and their environments. Altman is best known for developing the theory of privacy regulation, which explores how people manage their personal space and privacy in social contexts. He has authored numerous articles and books, helping to shape the field of psychology and providing valuable insights into human behavior and social relationships.