After graduating from the Université de Montréal, he studied at the University of Paris where he met Pierre Trudeau, with whom he co-founded the dissident political magazine Cité Libre upon returning to Montreal.
He is considered as one of the key men behind the creation of IYCS which today is present in over 80 countries with millions of members.
Since Juneau did not have a seat in the House of Commons of Canada, he attempted to enter parliament through a by-election, but was defeated in the Montreal riding of Hochelaga by the Progressive Conservative candidate, Jacques Lavoie.
[3][5] As Juneau was closely identified with the Liberal Party, he was viewed with hostility by the Progressive Conservative government of Brian Mulroney that came to power in the 1984 election.
He clashed with the Mulroney government over budget cuts and its reorganization of the CBC but nevertheless completed his seven-year term.
[5] After retiring from the CBC, he founded the World Radio and Television Council, a non-government organization supported by UNESCO.