He is frequently referred to as M.G. Brumbaugh, as is common in the Brumbaugh family.
Brumbaugh was elected as a Democrat to the Sixty-third and to the three succeeding Congresses (March 4, 1913-March 3, 1921).
Brumbaugh was elected as a Republican to the Seventy-eighth Congress to fill the vacancy caused by the resignation of James E. Van Zandt.
Brumbaugh served in the 101st Airborne Division of the United States Army, in a Rapid Deployment Air Assault Infantry Unit, and was decorated with the Army Achievement Medal and the Army Commendation Medal.