In about 1819, Mundy moved to
Illinois and remained there several years, until the losses he experienced due to a fire caused him to return to
New Jersey, where he continued for some years in other business pursuits. In 1831, he moved with his family to
Ann Arbor, Michigan. He was appointed
Justice of the Peace by the
Territorial Governor and was subsequently made a Judge of one of the Territorial Courts. In 1835, he was a delegate from the 4th district to the first State Constitutional Convention to prepare for the
admission of the State to the Union. Mundy was nominated to the office of
Lieutenant Governor on the
ticket with
Governor Stevens T. Mason. They both won the general election, and he served as Michigan's first Lieutenant Governor, from 1835 to 1840. Appointed by Governor
William L. Greenly and the
Michigan Senate to the office of Prosecuting Attorney, Mundy went on that year to serve as
Michigan Attorney General. In 1848, the
Michigan Supreme Court was expanded to include a fifth justice and a new judicial circuit, which were presided over by Supreme Court judges. Mundy was appointed the Supreme Court and to the new circuit and was a justice of the Michigan Supreme Court until his death. Mundy also served for several years as one of the appointed Regents of the
University of Michigan. ==Death==