Dr. Quentin Young, a longtime health advocate who was a personal physician to Martin Luther King during the civil rights leader's stay in Chicago, has died at age 92.

Young died of natural causes Monday at a daughter's home in Berkeley, California. His death was announced Tuesday on behalf of his family by Margie Schaps, who worked with Young at the Chicago-based Health & Medicine Policy Research Group, an organization Young founded.

Young also was a past president of the American Public Health Association and Physicians for a National Health Program.

Young served as personal physician to Chicago Mayor Harold Washington and author Studs Terkel. He was former Illinois Gov. Pat Quinn's doctor, adviser and friend. Quinn says the doctor devoted his life to advocating decent health care for all.