After law school George Van Hoomissen worked as a law clerk for the Chief Justice of the Oregon Supreme Court from 1957 until 1959. In 1959, he went into private legal practice in Portland and served as a 28-year-old Democrat to the Oregon Legislature. Van Hoomissen won re-election to the Oregon House of Representatives in 1960. In 1962, he began an eight-year stint as the district attorney for Multnomah County after defeating Charles E. Raymond in the election. As the DA he hired future Oregon Supreme Court justicesJacob Tanzer and W. Michael Gillette, and future judges Garr M. King, George M. Joseph, and William L. Richardson. He won re-election in 1966 and 1970, but ran unsuccessfully in 1968 for the Secretary of State office losing to Clay Myers by approximately 12,000 votes. In 1971, he resigned as the DA and moved to Texas to become dean of the National College of District Attorneys and a professor at the University of Houston’s Bates College of Law.
Judicial career
In 1973, Van Hoomissen returned to Oregon and was appointed as a judge for Multnomah County. From 1973 to 1978 he worked in the Department of Domestic Relations, and from 1978 until leaving the court in 1981 he worked in the General Trial Department. In 1980, Van Hoomissen was elected to the Oregon Court of Appeals to replace J. R. Campbell who had resigned to join the Oregon Supreme Court, beginning service in 1981. Van Hoomissen won re-election to a second six-year term in 1986, and then resigned from the court on September 30, 1988. He resigned to join the Oregon Supreme Court after winning the election to replace Berkeley Lent on May 17, 1988. While on the court Van Hoomissen wrote the majority opinion in Portland General Elec. Co. v. Bureau of Labor and Industries, 317 Or. 606, 859 P.2d 1143, the court’s most cited opinion. In 1996, he wrote the majority opinion overturning voter approved Measure 8 in Oregon State Police Officers' Ass'n v. State, 323 Or. 356, 918 P.2d 765, holding that the measure violated the United States Constitution’s Contract Clause. Van Hoomissen won a second six-year term on the state’s highest court in 1994 and then resigned on December 31, 2000 at the end of that second term after not seeking re-election.
Later life
George Van Hoomissen is currently a senior judge for the state of Oregon, allowing the Supreme Court Chief Justice to appoint him to any judicial position on a temporary basis. He also works as a private mediator and teaches at the Oregon Law Institute. He previously served as president of the Oregon District Attorneys Association and the Oregon Appellate Judges Association.