Commissioner
In early 1914, Interstate Commerce Commission commissioner Charles A. Prouty resigned to take the job as head of the Commission's Division of Valuation, and to run for the Senate in Vermont. This, in combination with the death in November 1913 of commissioner John Hobart Marble of California following an attack of acute indigestion, gave President Woodrow Wilson two seats to fill on the Commission. Wilson selected Winthrop More Daniels of New Jersey to fill Marble's seat, and Hall to fill Prouty's. This preserved the geographic balance on the Commission.
Hall was the first commissioner from the Rocky Mountain region. He served as Commission Chairman from 1917–18 and in 1924.
Hall took the lead on the Commission in the Shreveport rate case, in which the Commission determined it could regulate intrastate freight. This position was upheld by the Supreme Court In 1921, Hall was reappointed for another seven-year term by President Harding.
In late 1927, Hall submitted his resignation to President Calvin Coolidge, effective on the appointment of a replacement. He left the Commission in 1928.
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