Private practice, Dover, Delaware, 1841-
Clerk, Delaware State Senate, 1843
State representative, Delaware, 1844
Secretary of state, State of Delaware, 1846-1847
Aide-de-camp, Maj. Gen. Nathaniel Young, Commander of Delaware Militia, 1846-
Confidential clerk, U.S. Secretary of State, 1849-1850
Commissioner to settle claims of U.S. citizens against Brazil, 1850-1852
Private secretary, Pres. Millard Fillmore, 1852-
Attorney general, State of Delaware, 1855-1860
U.S. representative from Delaware, 1861-1863
First Delaware Cavalry colonel, 1863
U.S. attorney for the District of Columbia, 1870-1875
First auditor, U.S. Department of the Treasury, 1889-1893