After the War, Nelson studied law, was admitted to the bar about 1785, and practiced in Taneytown and Frederick. He held several local offices, including serving as a member of the Maryland House of Delegates in 1795, 1801, and 1802. He also served in the Maryland Senate from November 1803 to November 1804.[1]
Nelson was elected as a Democratic-Republican to the Eighth Congress to fill the vacancy caused by the death of Daniel Hiester, and was reelected to the Ninth, Tenth, and Eleventh Congresses, serving from November 6, 1804, until his resignation on May 14, 1810. He was one of the managers appointed by the House of Representatives in 1804 to prosecute the case in the impeachment trial of Samuel Chase, Associate Justice of the Supreme Court of the United States. He was elected associate justice of the fifth (later sixth) judicial circuit of Maryland in 1810.[1]
Personal life
Nelson was married to Mary Brooke Sim (d. 1794). Together, they were the parents of:[6]