He served as a member of the Maryland House of Delegates, representing Baltimore County, from 1914 to 1918.

His father was a lawyer who practiced in Towson after moving from Darlington, South Carolina, after the Civil War.

[4][5] McIntosh served as a member of the Maryland House of Delegates, representing Baltimore County, from 1914 to 1918.

[1][4] McIntosh ran unsuccessfully for the Democratic nomination for Maryland governor in 1929–1930, against incumbent Albert C. Ritchie.

They had two sons and a daughter, J. Rieman, David G. III and Mrs. Charles T. Williams Jr.[1][6] He was vestryman of the Trinity Protestant Episcopal Church in Towson for 40 years.

[1][2] McIntosh died on May 9, 1940, at his home Dumbarton House on York Road in Towson.