Career
Kellner was elected as a Progressive to the Canadian House of Commons in the 1921 Canadian federal election in the Edmonton East. He defeated Joseph Clarke and incumbent Henry Arthur Mackie in a 3 way race to serve his first term in office. Kellner switched to the new Athabaska district in the 1925 Canadian federal election.
Kellner was defeated by former Alberta Liberal Modern Language Association Charles Cross.
Kellner would serve out his second term before being defeated by John Francis Buckley in the 1930 Canadian federal election.
