The following season he took on the role of assistant trainer at Craven Cottage, graduating to trainer in 1908. He returned to Bristol City as reserve team trainer in 1910, becoming first team manager in 1915.
This is an unremarkable career, a Scottish professional playing in England, a journeyman who moved into management.
There is one episode, however, that sets Hamilton aside from his contemporaries.
On April 23, 1907 he was appointed manager of Paulistano Athletic Club. He was the first professional coach in Brazilian football. He introduced what is known as Systema Ingleza - the short passing game, as well as a systematic programme of training and preparation.
Hamilton was in São Paulo for 5 months before returning to Fulham, during which time Paulistano won the Campeonato Paulista.