Following graduation, Ellison began his career as a student teacher in the
Shawnee Heights USD 450 school district in
Topeka, Kansas, Ellison taught and coached at
Sumner High School in Kansas City, KS from 1963 to 1967. During his tenure at Sumner, Ellison was the first African-American elected to the
Kansas City Junior College Board of Trustees. While serving in the role of a trustee, Ellison met a representative of the
Kellogg Foundation who convinced him that he could become a community college president. This Kellogg Foundation connection led to a post-graduate scholarship at
Michigan State University that Ellison utilized to enter a graduate education program at Michigan State's campus in
East Lansing in 1969. Ellison earned his Ph.D. in education/leadership management from
Michigan State University in 1971. During his Ph.D. studies, Ellison served as Assistant to
Michigan State University President
Clifton R. Wharton Jr. from 1970 to 1971. In the fall of 1971, Ellison was hired as assistant to the chancellor at
Metropolitan Community College in Kansas City, Missouri, for the 1971–72 academic year. After one year in Kansas City, Ellison returned in 1972 to
Michigan State University as dean of students and assistant vice president of student affairs. Ellison was the first African-American to hold the dean of students position at
Michigan State University. In 1972, at the age of 31, Ellison was hired as president of
Seattle Central Community College. At the time he was the youngest CEO of a higher education institution in Washington and one of the youngest in the United States. Ellison held the position until 1974. In 1974, Ellison was hired to be the second President and CEO in the history of the
Cuyahoga Community College in Cleveland, OH. At
Cuyahoga Community College, Ellison was known as an educational innovator that pushed for the installation of computers on the campus. Ellison was also instrumental in the creation of the Tri-City Jazzfest Cleveland in 1980. Ellison held this position until 1991. In June 1992, Ellison was hired at the
University of Missouri-Kansas City as the Endowed Chair - Missouri Schutte Professor of Urban Affairs in the
Henry W. Bloch School of Management. Ellison held this position until 2001. After retiring from UMKC, Ellison returned to
Kansas City Kansas Community College in 2007 (retiring in 2009) in a consulting role while also serving as a trustee of the college for the second time. Ellison became the first KCKCC trustee to serve two non-conjoining terms on the board. ==Personal life and death==