Weintraub was born in Philadelphia, Pennsylvania, on April 17, 1929. He was the eldest child of Benjamin and Ray Segal Weintraub. He attended South Philadelphia High School, and then he attended West Chester State Teachers College (now West Chester University of Pennsylvania) where he received his B.S. in education in 1949. He continued his education at Temple University where he received his master's degree in English “in absentia,” as he was called to duty in the Korean War.

He received a commission as Army Second Lieutenant, and served with the Eighth Army in Korea receiving a Bronze Star.

After the War, he enrolled at Pennsylvania State University in September 1953; his doctoral dissertation “Bernard Shaw, Novelist” was accepted on May 6, 1956.

Except for visiting appointments, he remained at Penn State for all of his career, finally attaining the rank of Evan Pugh Professor of Arts and Humanities, with emeritus status on retirement in 2000. From 1970 to 1990 he was also Director of Penn State’s Institute for the Arts and Humanistic Studies.