John Scannell received his B.A. degree from Saint Ambrose College, Davenport, Iowa. He then studied at Kenrick Seminary in St. Louis, Missouri, and Saint Thomas Seminary in Denver Colorado, where he received his masters degree. He was ordained a Catholic priest on May 26, 1934, at the Archdiocese of Denver, and was assigned to Saint Mary’s Catholic Church in Colorado Springs, Colorado. He was commissioned a chaplain in the U.S. Army Reserves in January 1940, and was called to active duty shortly thereafter, serving at Camp Callan, Torrey Pines Mesa, San Diego California, beginning on March 31, 1941. After the bombing of Pearl Harbor he volunteered for active duty, arriving in Hawaii on April 17, 1942, where he was assigned to the 25th Infantry Division. He served with the Division throughout fighting at Guadalcanal, the Solomon Islands, and Luzon, Philippine Islands. After the securing of Guadalcanal, he became a local favorite among the local villagers, performing marriages and becoming known as “The Marryin’ Padre of Guadalcanal.” After the war he was founding Pastor of Christ the King Church in Denver, and Saint William the Abbot Church in Fort Lupton.