Sinkford was one of four sisters who all went on to attend college. Her Sinkford's career contains many firsts. At the age of 16, Sinkford enrolled in college at
Howard University, studying psychology and chemistry before pursuing dental school there. After graduating from dental school, Sinkford became the first woman Chair of the department of
prosthodontics, had a part-time dental practice, and earned a Ph.D. in physiology at
Northwestern University. This made her the first female prosthodontist with a PhD degree. She was the first black named to the National Advisory Dental Council; and was the first woman to be named as Associate Dean in dentistry. Later, she chaired the prosthodontics department at Howard, and she completed a residency in pediatric dentistry in 1974–1975. On July 1, 1975, Sinkford became the first female dean of an American dental school in the United States, and possibly in the world when she was appointed the dean of
Howard University, School of Dentistry. Sinkford served as dean for 16 years until 1991. She has been a member of the faculty for 33 years. Sinkford then became associate executive director of the
American Dental Education Association. She established its Center for Equity and Diversity in 1998, and directed it for 17 years. In 2015, Sinkford received the Distinguished Service Award from the
American Dental Association. She is also a past recipient of the
Candace Award from the
National Coalition of 100 Black Women. She is a member of the
Institute of Medicine and a fellow of the American College of Dentists and the
International College of Dentists. == Leadership ==