In 1947, he was appointed the Clinical Director of Montreal's Douglas Hospital. From 1971 to 1975, he was the Chair of the McGill University Department of Psychiatry.
From 1969 to 1972 He was one of the five members of the LeDain Commission A royal commission appointed in Canada to study the non medical use of drugs. He was an advocate for decriminalization of marijuana.
He was ahead of his time in that he supported research in the use of the active ingredient psilocybin to alleviate anxiety.