Callister also served for a time as president of the Verdugo Hills Council of the Boy Scouts of America.

[3] He previously served in the LDS Church as a bishop, stake president, regional representative, and area seventy.

In 2001 Callister helped release a booklet on reaching out to non-members called "Doctrine of Inclusion" and stated, "We're imperfect people...[but] we want it to be said that we're the best neighbors in the world.

Callister was simultaneously accepted by the membership as the general president of the church's Sunday School, succeeding Russell T. Osguthorpe.

[8] While Callister was serving as Sunday School General President, the church shifted to use of the "Come, Follow Me" curriculum.

His father-in-law, Angelo Louis Saporiti, joined the church while serving in the military in Hawaii some time after he had married.

The organization's mission is to rekindle a spirit of patriotism, educate people about the Founding Fathers and the Constitution, and develop an awareness of God's hand in America.