Gail was born in Batavia, Ohio, one of two children and the only daughter of Della June and Harry Denver Warman. She started piano lessons at an early age, and when she enrolled at Mount Vernon Academy as a freshman, began voice lessons under Roger McNeily. She also worked for him during all four years at the academy, an experience that inspired her to pursue a career in music. In addition to her activities in music, she also participated as a speaker in youth evangelism meetings held in Hamlet, Ohio.

Following graduation from MVA in 1969, where she was secretary of the senior class, Gail enrolled at Southern Missionary College, now Southern Adventist University, as a music major and studied voice with and sung in the choirs under Don Runyan. She transferred to Andrews University at the end of her freshman year and continued with her music major, studying voice with and singing in choral groups under James Hanson and Rudolf Strukoff. She was a featured soloist in a presentation of the Easter portion of the Messiah in February 1972 and in Ralph Vaughn William's Hodie in November of that year, a performance conducted by Ralph Coupland.

While at AU, Gail met and dated Stephen John Hall, a music major. During the fall of his senior year he did his student teaching at Cedar Lake Academy and then was asked to direct the band for the remainder of the year when the director left. She married Stephen in June 1973 and, following their graduation from AU at the end of the summer, joined him at CLA to teach piano and voice and direct the choral program.

They were there for the next seven years, moving to California in 1980 where he had been hired to teach at Pacific Union College Preparatory School and to assist at PUC as director of the band and teach brass lessons and secondary music methods. She assisted as an adjunct voice teacher at the college and was also hired in the following year to teach at the preparatory school. During this time she also provided music at a nearby Christian Science church.

In 1982 they accepted music positions at Campion Academy in Colorado, where they taught for four years. During those years she sang as a member in and soloist with the Loveland Choral Society as they presented performances of the Mozart Requiem, Hodie, and other major choral works. In 1986 they moved to Lincoln, Nebraska, where Steve was hired to direct the band at Union College, and she became the office manager and academic advisor for the college education department.

While at UC, she was active in music, serving as an adjunct vocal teacher for the college, minister of music at the College View Church, working as a soloist under Melvin West for the Westminster Presbyterian Church, and performing as a free-lance vocalist in the area. She also pursued graduate work in music at the University of Nebraska, Lincoln, studying voice under Richard Milton Grace.

In 2000 the Halls accepted positions at Spring Valley Academy in Centerville, Ohio, where she directed the vocal/choral program at the school, directed the choirs in grades 5-8, and taught classroom music in grades K-4. Steve served as Director of Development at the academy and provided brass groups for the Kettering church for three of those years. They would live there for over a decade before moving to San Diego, California, in 2011, where they now reside.

The Halls have two daughters, Jennifer, a clarinetist and singer, and Amanda. Amanda, who is an oboist and soprano, attended Union College and then transferred to La Sierra University, where she completed a bachelor's degree in music in 2006. She completed a master's degree in voice performance at the University of Southern California in 2008 and then received a full scholarship for study in the opera program at Yale University, where she completed a master's degree in opera performance in 2010. She is now pursuing a successful career in opera.

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