Career
He served as an auxiliary bishop of the Archdiocese of Saint Louis from 1971-1991. Born in Jefferson City, Missouri, Charles Roman Koester was ordained a priest for the Archdiocese of Saint Louis on December 20, 1941. On January 2, 1971 Pope Paul VI appointed him as the Titular Bishop of Suacia and Auxiliary Bishop of Saint Louis.
He was consecrated by Cardinal John Joseph Carberry on February 11, 1971.
The principal co-consecrators were Bishops Glennon Flavin of Lincoln and Lawrence Graves Auxiliary Bishop of Little Rock. He continued to serve as an auxiliary bishop until his resignation was accepted by Pope John Paul II on September 10, 1991.
He died at the age of 82 on December 24, 1997.