World War I

During the First World War, he served as a sergeant with the One Hundred and Seventy-sixth Field Artillery, United States Army, in 1917 and 1918.

Political career

He was engaged in the lumber and general contracting business at West Lafayette, Ohio, 1918-1945. He was a member of the school board of West Lafayette, Ohio, for eight years. He was a member of the Ohio House of Representatives from 1935 to 1940, serving as minority whip from 1937 to 1939 and as majority leader and speaker pro tempore in 1939 and 1940.

McGregor was elected as a Republican to the Seventy-sixth Congress to fill the vacancy caused by the death of William A. Ashbrook. He was reelected to the Seventy-seventh and to the eight succeeding Congresses and served until his death. He served as chairman of the Special Committee on Chamber Improvements during the Eightieth and Eighty-third Congresses. He had been renominated to the Eighty-sixth Congress.

Death

He died in Coshocton, Ohio, in 1958 at the age of 62. Interment in Fairfield Cemetery in West Lafayette, Ohio. McGregor voted in favor of the Civil Rights Act of 1957.^[2]