Warren Martin Hern , M.D. , M.P.H. , Ph.D. ( born 1938 ) is an American physician best known for performing late-term abortions . In 1973 , he founded Boulder Abortion Clinic in Boulder , Colorado . Hern was a founding member of the National Abortion Federation , and authored '' Abortion Practice '' , a comprehensive text on operating and evaluating abortion facilities . He and doctors LeRoy Carhart , Shelley Sella , and Susan Robinson were the subject of the 2013 documentary '' After Tiller '' about the four openly advertising late-term abortion providers in the United States after the 2009 assassination of George Tiller
2009 assassination
Assassination of George Tiller
Warren Hern