Joseph Smith is a controversial individual in American religious history. His moral character is defended throughout this thesis by challenging some of the early sources used to condemn him. Multiple contemporary sources are also highlighted to indicate that Smith was an imperfect but reasonably moral individual. Specific accusations against Smith for his telling of the First Vision, his depiction of the angel Moroni, the translation of the Book of Mormon, and his practice of polygamy are addressed. There is no substantive evidence to prove Smith evolved his stories over time or that Smith practiced plural marriage for the sake of sexual deviancy. Smith’s impact within Christianity continues to be seen in the influence of his teachings among millions of followers. His theological influence is discussed on the topics of modern revelation and scripture, the nature of the Godhead, eternal marriage and godhood, and a re-envisioned afterlife. The evolving doctrine among some traditional Christian groups is also briefly discussed on these theological topics.