Architectural historian of classical Rome, professor of art, Smith College, 1965-. MacDonald's father was William Lloyd MacDonald, Sr., and his mother Susan E. Elrod (MacDonald). He served in World War II in the U.S. Army Air Forces, 1942-1945, rising to first lieutenant. Afterward, MacDonald entered Harvard University, receiving his A.B. in 1949. He began lecturing at:Boston Architectural Center in the history of architecture in 1950, continuing for his A.M.at Harvard.