Elder Dunn was sustained as a General Authority Seventy of The Church of Jesus Christ of Latter-day Saints on April 3, 2021, at age 63. At the time of his call, he had been serving as a member of the Twelfth Quorum of the Seventy in the Utah Area. Elder Dunn has served in a number of Church callings, including full-time missionary in the Hawaii Honolulu Mission, counselor in a bishopric, high councilor, bishop, stake president, ward Young Men president, and president of the South Africa Johannesburg Mission from 2014 to 2017. 

Elder Dunn received a bachelor of science degree in mass communications from the University of Utah in 1981. In 2008 he received a master of arts degree in communication (Film and New Media) from the University of Utah. From 1995 to 2010, he was president of Dunn Communications, Inc. In 2010, he was named general manager of KUED (PBS). At the time of his call as a General Authority Seventy, he was the managing director of BYUtv and BYUradio.