Horton, Bayard Taylor (1895–1980), American physician. Horton is known for classic descriptions of two clinical entities. In 1932 Horton and two colleagues from the Mayo Clinic described giant cell arteritis as a new disease entity. This disease, however, was actually described for the first time two years earlier by an American physician, Max Schmidt, in a study of intracranial aneurysms. In 1939 Horton described the condition now known as a cluster headache or Horton's syndrome.