Roy Lindsay Kellock was born in Perth, Ontario, on 2 Nov 1893.
 
He was the son of James Francis Kellock and Annie McDonald.
 
He graduated from McMaster University with a B.A. in 1915 and began articling in 1917 with R.E. Gray in Toronto.
 
Called to the bar in 1920, he joined Donald, Mason, White, & Foulds in Toronto, where he practised law for 22 years.
 
He was appointed to the Ontario Court of Appeal in 1942 and to the Supreme Court of Canada on 3 Oct 1944.
 
During his term on the Supreme Court, he often acted as arbitrator or conciliator in railway labour disputes across Canada.
 
With his colleague, Justice Robert Taschereau, he co-chaired the 1946 Royal Commission on Spying Activities in Canada, which was set up as a result of the so-called "Gouzenko Affair".
 
He served on the Supreme Court for 13 years and retired on 15 Jan 1958.
 
Justice Kellock died on 12 Dec 1975, at the age of 82.