I had the privilege of speaking with Brian Hales about his upcoming three-volume history of Joseph Smith's Polygamy, published by Greg Kofford Books. Brian is a practicing anesthesiologist, author and scholar of Mormon History, with emphasis on Mormon Fundamentalism and Plural Marriage. He is also an active, faithful Latter-Day Saint. In this interview, Brian discusses his research of the historical context, circumstances, and theology that gave rise to Joseph Smith's secret practice of polygamy in the Kirtland and Nauvoo periods. We talk about specific cases and incidents, including Fanny Alger, polyandry, Helen Mar Kimball, Emma Smith's struggle with the Principle, as well as Brian's perspective as a faithful Latter-Day Saint who embraces the theological necessity for the Mormon doctrine of Plural Marriage.