Dr. H. Jack Geiger, who ran away to Harlem as a teenager and emerged a lifelong civil rights activist, helping to bring medical care and services to impoverished regions and to start two antiwar doctors’ groups that shared Nobel Peace Prizes, died Dec. 28 at his home in Brooklyn. He was 95.

Dr. Geiger was a co-founder, with Dr. Count Gibson, of community health centers in South Boston and in Mound Bayou, in the Mississippi Delta. They provided desperately needed health care, food, sanitation, education, jobs and social services — what Dr. Geiger called “a road out of poverty.” The centers inspired a national network of clinics that now number more than 1,300 and serve almost 28 million low-income patients at more than 9,000 sites.