Justice Randy J. Holland, the longest-serving judge ever to sit on Delaware’s highest court, has announced that he will retire in March, capping a 30-year career of public service that reached far beyond the bench.

Holland, 70, became the youngest person to serve on the Supreme Court in 1986, when he was appointed by Gov. Michael Castle to fill the vacancy left by John J. McNeilly Jr. He was reappointed to a second 12-year term by Gov. Tom Carper; and in 2011, Gov. Jack Markell nominated Holland for an unprecedented third term on the court.