Proctor was president of the Village of Proctor in 1930, and chairman of the Town of Proctor Republican Committee in 1932. He spent his entire career in the private sector as an executive of the Vermont Marble Company, the family-owned business. He was
president from 1952 to 1958 and
chairman from 1958 to 1967. Proctor enlisted in the
US Army for
World War I in 1917, completed officer training and was commissioned as a
second lieutenant in the
71st Regiment, serving in
France throughout the war. Proctor was
Lieutenant Governor of Vermont from 1941 to 1945. He was elected
Governor of Vermont in 1944 and served from 1945 to 1947. During his tenure, the state debt was reduced, state aid to education, old age assistance payments, and teacher's minimum salaries were increased. He returned to private business and established the Mortimer R. Proctor Trust which supports non profit activities in arts, culture, education, and religion in
Proctor, Vermont. ==Death and legacy==