Salmon was born in Lansingburg (now Troy, New York), the son of a physician. and became New York State mental hospital bacteriologist. The two years he spent at Willard gave him entry into the world of
psychiatry. Salmon entered the
U.S. Public Health Service (USPHS) in 1903. The following year, he was assigned to the
Immigration Station on
Ellis Island to examine the
immigrants arriving from Europe. At that time, Federal law excluded entry of immigrants with evidence of
mental illness,
feeble mindedness,
epilepsy, or
criminal background. Detainees were kept at Ellis Island until arrangements could be made to return to Europe. Salmon was distressed by the poor conditions under which the detainees were kept and pressed his superiors for improvements at Ellis Island. He also urged that those applying for entry into the United States be examined at the port of embarkation to weed out those with excludable conditions. He was unsuccessful and was transferred to a Public Health Service hospital in Chelsea, Massachusetts where he practiced
general medicine for four years. He was assigned as medical officer to provide care to fishermen. On his return, he recommended to the Public Health Service that a
hospital ship be provided to give medical care to the northeastern fishing communities. He wrote articles and testified before
U.S. Congressional committees. His efforts in bypassing his superiors were not met kindly. However, five years later, Congress authorized a hospital ship. In 1911, the
New York State Commission in Lunacy asked the Public Health Service to grant Salmon a leave of absence from the Public Health Service to study the problems of foreign-born patients in state mental hospitals. Salmon organized statistical surveys and helped to devise a uniform system of reporting admissions and discharges. ==Mental hygiene movement==