Dr. Clive O. Callender is an expert in minority transplant surgery and organ/tissue donation. He has served on staff at Howard University Hospital since 1973, where he helped develop the first minority-directed dialysis and transplant center and histocompatibility and immunogenetic laboratory in the U.S. His highly successful efforts and programs were used as models in 1991 to conceptualize and develop the National Minority Organ/Tissue Transplant Education Program (MOTTEP) to increase minority donation rates nationally.

National MOTTEP is the first national organization to identify a two-fold solution to the donor shortage which includes increasing the number of minority donors and decreasing the number of persons who need transplants through a health promotion campaign aimed to prevent the need for transplantation.

In January 1996, Callender was appointed chairman of the Department of Surgery and in February 1996, appointed the first LaSalle D. Leffall, Jr. Professor of Surgery at the Howard University College of Medicine.