Joseph Fielding Smith’s family tree alone makes him a significant player in the history of The Church of Jesus Christ of Latter-day Saints.

His father, Joseph F. Smith, was the faith’s sixth president. His grandfather was Hyrum Smith, who was slain with his great-uncle, church founder Joseph Smith. His son-in-law, in fact, was apostle Bruce R. McConkie, a theological kindred spirit.

Joseph Fielding Smith served as an apostle for 60 years, church historian for 49 and as the church’s 10th president for two. But he will forever be remembered more for his prose and his polemics than for his positions or his pedigree.

A conservative and orthodox thinker, he wrote more than two dozen books, answered religious questions from lay members and engaged in high-level, high-stakes debates with fellow apostles James Talmage, John Widtsoe and other leading Latter-day Saint intellectuals. They discussed, debated and disputed issues ranging from scriptural interpretation to the age of the Earth and the theory of evolution.

Joseph Fielding Smith was, scholar Matthew Bowman argues, “the most important Latter-day Saint theologian of the 20th century.”

On this week’s show, Bowman, head of Mormon studies at Claremont Graduate University and author of the recently released “Joseph Fielding Smith: A Mormon Theologian,” talks about this towering Latter-day Saint man of letters.