He was later responsible for directing work in the balance of international payments and Canadian-American investment flows.
In 1939, his work in the area of international trade had been recognized by the award of the Gold Medal of the Professional Institute of the Civil Service.
During World War II, Marshall worked for the Wartime Prices and Trade Board and set up the regional manpower records for the National Selective Service.
Following the death of Sedley Cudmore in 1945, he assumed the office Dominion Statistician.
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