Converted as a teenager, following a miraculous healing, Jean Darnall began her preaching and healing ministry at the age of sixteen. Later, she and her husband, Elmer, went to Panama as ordained missionaries for the International Church of the Foursquare Gospel. Following their missionary service, they planted Foursquare churches in Canada and the eastern United States.

They also ministered in Western Australia for six years, where they founded several churches, established a Bible College, and sent missionaries to New Guinea.

Jean was appointed and served six years as associate pastor of Angelus Temple, Los Angeles, following the death of Aimee Semple McPherson, who had been her pastor and mentor.

She had a strong influence during the Charismatic Renewal upon many traditional churches, including the Anglican Church in Great Britain. While living in England for twenty-five years, she and her husband established a Foursquare church and Bible College. During that time they influenced, The Festival of Light, an event that resulted in thousands of young people being involved in The March For Jesus in Britain and worldwide.

Jean has been closely involved with Youth With a Mission from its beginning and teaches at their bases internationally. Much of her teaching has been with the Korean branch of YWAM with Rev. David Ross and AIIM.

She served on staff as associate pastor at The Church On The Way, Van Nuys, where she conducted weekly services for six years.

Jean blends into her biblical messages a prophetic perspective and offers a healing ministry of wholeness. She lectures regularly at King's University, located at The Church On The Way.

Her inspiring book, Heaven Here I Come, is a personal account of many miraculous answers to prayer.

Jean and Elmer have two married children, John and La Donna, along with five grandchildren and six great-grandsons. Elmer went to be with the Lord in 2004.