Callaghan began writing stories that were well recieved and soon was recognized as one of the best short story writers of the day.
Callaghan's novels and short stories are marked by undertones of Roman Catholicism, often focusing on individuals whose essential characteristic is a strong but often weakened sense of self.
Callaghan married Loretto Dee, with whom he had two sons: Michael (born November 1931) and Barry (born 1937), poet and author.
Callaghan was born and raised in Toronto, Ontario.
Callaghan's novels and short stories are marked by undertones of Roman Catholicism, often focusing on individuals whose essential characteristic is a strong but often weakened sense of self.
Callaghan was awarded the Royal Society of Canada's Lorne Pierce Medal in 1960.