Two years later, he was appointed by Woodrow Wilson as the receiver of public moneys of the United States land office in Rapid City, a position he held until he was elected to the U.S. House of Representatives.

In 1923, Gandy moved to Washington, D.C., after he was hired as a lobbyist as the executive secretary of the National Coal Association (NCA), a position he held until 1930.

He left Pittson to become chairman of the Bituminous Coal Producers Board in Cincinnati, Ohio, between 1937 and 1940.

He worked his remaining years until retirement in executive advisory roles for the Elk River Coal & Lumber Co. and Buffalo Creek & Gauley Railroad Co. in Widen, West Virginia.

He was interred in Mountain View Cemetery in Rapid City, South Dakota.