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Lipez formerly served as a staff attorney in the United States Department of Justice Honor Program, Civil Rights Division, from 1967 to 1968. He then served as a special assistant and legal counsel to Maine Governor Kenneth M. Curtis from 1968 to 1971 and as a legislative aide to United States Senator Edmund Muskie from 1971 to 1972, until entering private practice in Portland, Maine, where he stayed until joining the Maine trial court in 1985.
State judicial service
Lipez's judicial career began with his service as a justice of the Maine Superior Court, on which he served from 1985 to 1994. He was appointed to the Maine Supreme Judicial Court in 1994, where he served until his investiture as a federal judge.
In August 2017, Lipez dissented when the en banc circuit, in an opinion by Judge Kayatta, rejected a lawsuit seeking to give Puerto Ricans the right to vote.
References
Marie T. Finn (2010). Diane R. Irvine and Mary Lee Bliss (ed.). The American Bench: Judges of the Nation. Forster-Long. p. 63. ISBN978-0931398636.