Joseph Kempker graduated from Josephinum College and Seminary in Worthington, Ohio, in 1939. He was ordained a Catholic Priest on May 28, 1939, and served as assistant pastor at Saint Cecillia’s Catholic Church in Omaha, Nebraska. In 1942 he entered military service as a U.S. Navy Chaplain, and served as a Chaplain to the Third Marine Regiment in the South Pacific for two years. Following the war he returned to Josephinum Seminary as a member of the faculty until 1954, when he moved to Omaha, Nebraska, to organize Saint Pius X Parish. He served there until he suffered a stroke and retired in 1968. In retirement, he was chaplain at Saint Francis Hospital in West Point for a time.