Sumiko Tanaka Hennessy (born November 8, 1937) is an American social worker, trauma therapist, academic, and activist for the Asian-American community in Denver, Colorado. Born in Yokohama, Japan, she earned her Master of Social Work degree at Fordham Graduate School of Social Service and her doctorate at the University of Denver. She was a founding board member and later executive director of the Asian Pacific Development Center, which provides mental health services, counseling, education, and youth activities for the Asian immigrant community in the Denver metropolitan area. In 2000 she helped inaugurate the Tokyo University of Social Welfare and is presently a professor emeritus of that institution. In 2004 she and her husband founded Crossroads for Social Work, LLC, a training program