Graduating there as an M.D., he served as Surgeon with the 16th Battalion, Volunteer Militia during the Fenian Raids in 1866. He was also the first editor/publisher of the Picton New Nation as well as a teacher and school inspector. From 1878 to 1892 he was the Liberal member for Prince Edward County in the federal parliament.

At Cedarhedge, Platt had two blood-hounds as pets which “the prisoners thought would devour them on slight provocation”! Evidence of the dogs can be seen on the South-west window sill in the gallery on the museum’s second floor.

His only child, Garfield, served as the Kingston Penitentiary Surgeon from 1931-1942. Warden Platt died Sept. 27, 1919 at Picton, Ontario.