Crowell returned to Cleveland and became a chemist in the laboratories of Otis Steel Company. He was promoted to superintendent. He then organized the firm Crowell & Murray, metallurgists and chemists. He worked there as a mining engineer and chemist. He then formed Crowell & Little with Bascomb Little, a firm associated with testing reinforced concrete. The company disbanded after both men entered military service. The indictment was dismissed on January 30, 1925. On January 24, 1931, he was nominated as brigadier general of the
United States Army Reserve by President Hoover. He was regional director of the
National Recovery Administration, Ohio director of the National Emergency Council, and regional director of the
Federal Housing Administration and Social Security Board. He was also chairman of the Ohio Repeal Council, which fought against prohibition in Ohio. In 1938, he resigned as the regional director of the Social Security Board for Michigan, Ohio, and Kentucky. He then became president of Central National Bank. In 1941, he was director of the
New York, Chicago & St. Louis Railroad. In 1940, Crowell conducted a preliminary survey of the War Department's defense program for Secretary of War
Henry L. Stimson. The effort was extended and he remained in Washington, D.C., as a special defense consultant under Secretary Stimson throughout his tenure through
World War II. On June 4, 1946, he received the Williams Medal for his contributions to national defense. Crowell wrote or assisted in the compiling of a number of books, including: •
How America Went to War (1921), co-written with Robert Forrest Wilson •
Munitions of War •
Iron Ores of Lake Superior, co-written with Charles B. Murray ==Personal life==