He served as a member of the Maryland House of Delegates, representing Frederick County in 1867 and from 1894 to 1900.

[2] Rouzer enlisted on August 19, 1862, in Company D of the 6th Regiment Maryland Volunteer Infantry as first lieutenant.

He was elected as register of wills of Frederick County and served in that role for six years.

[2] He served as a member of the Maryland House of Delegates, representing Frederick County in 1867 and from 1894 to 1900.

[1] In 1900, he was appointed by President William McKinley as deputy register of wills in Washington, D.C.

[1][3] In 1912, the Republicans wanted to nominate Rouzer for state comptroller, but he declined due to his health.

[2] Rouzer was a charter member and served as president of the Mechanicstown Water Company for a number of years.

They had five children, including Mrs. Leister Armacost, Mrs. Harry Brown and Horace C.[1][2][3] He was a member of St. John's Lutheran Church, an Evangelical Lutheran Church and was an officer in its Sunday school.

[2][3] Later in life, Rouzer had poor eyesight and was unable to read starting around 1912.