He served as a member of the Maryland House of Delegates, representing Harford County, from 1910 to 1911.

[1][2] Sullivan worked for the telegraph department of the Baltimore and Ohio Railroad starting in 1891.

Sullivan served as a member of the Maryland House of Delegates, representing Harford County, from 1910 to 1911.

[2][4][6] He was one of the Democratic candidates for the House of Delegates in 1911, after a tie vote in the primary with Joseph W. Archer.

[4][6] Sullivan served as vice chairman of the Order of Railroad Telegraphers for fifteen years.