David Miller is a common name and can refer to various individuals across different fields. One notable David Miller is a Canadian politician who served as the mayor of Toronto from 2003 to 2010. He is known for his focus on environmental issues and urban development during his tenure. Another David Miller is a prominent figure in the field of psychology, particularly known for his work on cognitive psychology and behavioral therapy. His research has contributed to understanding how people think and behave, influencing therapeutic practices and educational methods.