In October 1956, Governor
Joseph B. Johnson appointed Keyser to the Superior Court. Keyser's son
F. Ray Keyser Jr. became governor of Vermont in 1961. Keyser Sr. administered the
oath of office to his son, the only time this has occurred in Vermont history. After eight years on the Superior Court bench, Keyser was appointed to the Vermont Supreme Court in October 1964, filling the vacancy caused when Associate Justice
Harold C. Sylvester requested to return to the superior court bench. Keyser served on the Supreme Court for eleven years, until he reached the
mandatory retirement age in 1974. ==Later life==