An American Physician in Turkey by Dr. Clarence D. Ussher is a haunting and heroic account of humanitarian service during one of the darkest episodes of the 20th century—the Armenian Genocide. Serving as a missionary physician in the Ottoman Empire during World War I, Ussher found himself at the center of escalating violence in eastern Anatolia. His memoir offers a frontline account of the massacres, deportations, and atrocities committed against the Armenian population, witnessed firsthand as he treated the wounded, sheltered refugees, and tried to mobilize aid. Written with moral urgency and clinical clarity, Ussher's story is as much a testament to courage and conscience as it is a record of historical tragedy. He documents not only the suffering of the Armenians, but the complicity and indifference of local officials, the breakdown of Ottoman society, and the risks faced by those who defied genocidal policy. While grounded in the realities of war and politics, Ussher also reflects on faith, resilience, and the ethical demands of witness. An American Physician in Turkey is a crucial early source on the Armenian Genocide and a powerful example of medical and moral resistance in the face of systemic atrocity.