Richard Bayley, an American physician, born at Fairfield, Conn., in 1745, died Aug. 17, 1801. He studied in the hospitals of London, and in 1772 returned to New York and commenced practice, becoming especially distinguished in the treatment of croup. In 1775 he revisited England, but in the spring of 1776 returned to New York as staff surgeon to Sir Guy Carleton. He resigned his commission in the army the next year and resumed practice in New York. His letters to Dr. Hunter upon the croup were published in 1781. In 1787 he gave lectures upon surgery. The next year his collection of specimens of morbid anatomy was totally destroyed by the "doctors' mob." In 1792 he was professor of anatomy in Columbia college, and afterward of surgery. He was the first health officer of New York, and in 1797 published an essay, and afterward a series of letters, on the yellow fever then prevailing, attributing it entirely to local causes, and repudiating the theory of contagion. He exerted himself to obtain the passage of proper quarantine laws, in which he was finally successful. He died of ship fever contracted in the discharge of his official duties.

His daughter, Mrs. Seton, founded the Sisterhood of Charity in the United States. (See Seton, Eliza Ann).