(1864–1922), an American physician, practiced psychiatry in Albany, New York and served as editor to medical journals.
In 1908, Mosher was named Clinical Professor of Insanity, Nervous Disease and Electro-Therapeutics at the Albany Medical College, a position he held until his death in 1922.
He became a joint editor of the Albany Medical Annals and held the position for 25 years until his death.
He was active in civic organizations including the Albany Academy, the Albany Hospital, and the Advisory Selective Service Board for New York during World War I. Mosher is credited with establishing the first psychiatric ward as part of a general hospital, a practice later adopted throughout the United States.
By 1931, 122 of 420 general hospitals reported building special facilities for psychiatric patients.