Private practice, Baltimore, Maryland, 1839-1844
Private practice, Frederick, Maryland, 1844-1854
Deputy attorney general, Frederick County, Maryland, 1845-1850
Private practice, Washington, D.C., 1854-1855
Private practice, Howard County, Maryland, 1863-1870, 1873-1886
Senior professor of law, Columbian College, Washington, D.C., 1866-1867
State representative, Maryland, 1870
U.S. representative from Maryland, 1871-1873