John Milton Platt was a physician and political figure in Ontario

Ontario

Ontario is a province of Canada, located in east-central Canada. It is Canada's most populous province and second largest in total area. It is home to the nation's most populous city, Toronto, and the nation's capital, Ottawa....

, Canada. He represented Prince Edward

Prince Edward (electoral district)

Prince Edward was a federal electoral district in Ontario, Canada, that was represented in the Canadian House of Commons from 1867 to 1904. It was created by the British North America Act of 1867, and consisted of the County of Prince Edward....

 in the Canadian House of Commons

Canadian House of Commons

The House of Commons of Canada is a component of the Parliament of Canada, along with the Sovereign and the Senate. The House of Commons is a democratically elected body, consisting of 308 members known as Members of Parliament...

 from 1882 to 1891 as a Liberal

Liberal Party of Canada

The Liberal Party of Canada , colloquially known as the Grits, is the oldest federally registered party in Canada. In the conventional political spectrum, the party sits between the centre and the centre-left. Historically the Liberal Party has positioned itself to the left of the Conservative...

 member.

He was born in Athol Township, Upper Canada

Upper Canada

The Province of Upper Canada was a political division in British Canada established in 1791 by the British Empire to govern the central third of the lands in British North America and to accommodate Loyalist refugees from the United States of America after the American Revolution...

, the son of Dyer Platt and Myria Morgan. Platt was educated at the Fort Edward Institute in New York

New York

New York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...

 state and at Victoria University

Victoria University in the University of Toronto

Victoria University is a constituent college of the University of Toronto, founded in 1836 and named for Queen Victoria. It is commonly called Victoria College, informally Vic, after the original academic component that now forms its undergraduate division...

 in Cobourg

Cobourg, Ontario

Cobourg is a town in the Canadian province of Ontario, located in Southern Ontario 95 km east of Toronto. It is the largest town in Northumberland County. Its nearest neighbour is Port Hope, to the west. It is located along Highway 401 and the former Highway 2...

. In 1872, Platt married Amelia Brnnscombe. He also served as a public school inspector and as surgeon for the militia. Platt was editor and publisher for the Picton

Picton, Ontario

Picton is an unincorporated community located in Prince Edward County in southern Central Ontario, Canada. It is the county seat and largest community. Picton is located at the south-western end of Picton Bay, a branch of the Bay of Quinte, which is along the northern shoreline of Lake Ontario...

 New Nation. His election in 1888 was overturned after an appeal but he won the by-election that followed. He was defeated by Archibald Campbell Miller

Archibald Campbell Miller

Archibald Campbell Miller was a farmer and political figure in Ontario, Canada. He represented Prince Edward in the Canadian House of Commons from 1891 to 1896 as a Conservative member....

 when he ran for reelection in 1891. Platt later served as warden for Kingston Penitentiary

Kingston Penitentiary

Kingston Penitentiary is a maximum security prison located in Kingston, Ontario between King Street West and Lake Ontario....

from 1899 to 1913. He died in Picton at the age of 79.