Born in Nebraska in 1921, Emanuel was raised in the state. He spent his early years in the western United States where he worked at a variety of jobs. At age twenty he joined the United States Army and served as confidential secretary to the Assistant Inspector General of the U.S. Army Benjamin O. Davis, Sr. After his discharge, he did his undergraduate work at Howard University and obtained graduate degrees from Northwestern University (M.A.) and Columbia University (Ph.D.). He then moved to New York City, where he taught at the City College of New York (CUNY), where in the 1960s he taught the college's first class on African-American poetry and mentored future scholars such as Addison Gayle Jr.