In the early and mid-twentieth century, Joseph Fielding Smith’s (1876–1972) life as a public historian and theologian shaped the religious worldview of generations of Latter-day Saints. Matthew Bowman examines Smith’s ideas and his place in American religious history. Smith achieved position and influence at a young age, while his theories about the age of the earth and the falseness of evolutionary theory brought fame and controversy. As Bowman shows, Smith’s strong identity as a Saint influenced how he blended Protestant fundamentalist thought into his distinctly LDS theological views. Bowman also goes beyond Smith’s well-known conservatism to reveal him as an important thinker engaged with the major religious questions of his time. Incisive and illuminating, Joseph Fielding Smith examines the worldview and development of an influential theologian and his place in American religious and intellectual history.