He was an economics advisor to four presidents, Coolidge, Hoover, Roosevelt and Eisenhower.

[2] He joined the faculty of the School of Economics and Politics at the Institute for Advanced Study (IAS) on September 1, 1938, and remained there until his death in 1958.

[3] In 1922, he joined the Federal Reserve Board as Director of Research where he served as a mentor to Emanuel Goldenweiser and built a bridge between the statistics division and central bank policy.

[4] He was an economic advisor to the Bank of England from 1928 to 1930, the first American to serve in that capacity.

[6] In 1944 Stewart along with IAS colleague Robert B. Warren worked for the Treasury Department in Washington, advising them on the relation between fiscal operations and the banking system.