 After an internship of three years in New York, he served at Tulane in various capacities, becoming professor of diseases of the skin in 1905 and dean of the medical department in 1908.In 1894 he founded the Louisiana Leper Home, and in 1896 Dr. Dyer became editor of the "New Orleans Medical and Surgical Journal".He was president of the Louisiana State Medical Society (1902–03), vice president of the American Medical Association (1903), vice-president of the New York Medico-Legal-Society (1908–10), and a lieutenant in the United States Army Medical Reserve Corps (1908).