Grant was born in Salt Lake City, Utah Territory to Jedediah Morgan Grant and Rachel Ridgeway Ivins. Jedediah Grant had served as Brigham Young's counselor in the First Presidency of the LDS Church. However, Jedediah died nine days after Heber was born, and Rachel became the dominant influence in Heber's life. In business, Heber J. Grant helped develop the Avenues neighborhood of Salt Lake City. In 1884 he served a term as a representative to the Utah Territorial Legislature.
In similar fashion, he expressed a desire to be a successful bookkeeper, although many of his associates criticized his penmanship. He likewise practiced his penmanship until such a point where he was invited to teach penmanship at one of the local academies.
Grant succeeded Joseph F. Smith as president of the LDS Church in November 1918. However, he was not sustained in the position by the general church membership until June 1919, as the influenza pandemic of 1918 forced a delay of the church's traditional springtime general conference.
During his tenure as president, Grant enforced the 1890 Manifesto outlawing plural marriage and gave guidance as the church's social structure evolved away from its early days of plural marriage-based families. In 1927, he authorized the implementation of the church's "Good Neighbor" policy, which was intended to reduce antagonism between Latter-day Saints and the United States government. In 1935, Grant excommunicated members of the church in Short Creek, Arizona that refused to sign the loyalty pledge to the church that included a renunciation of plural marriage. This action signalled the formal beginning of the Mormon fundamentalist movement, and some of the excommunicated members went on to found the Fundamentalist Church of Jesus Christ of Latter Day Saints.
One of Grant's greatest legacies as president is the welfare program of the LDS Church, which he instituted in 1936. He said, "our primary purpose was to set up, insofar as it might be possible, a system under which the curse of idleness would be done away with, the evils of a dole abolished, and independence, industry, thrift and self-respect be once more established amongst our people. The aim of the Church is to help the people help themselves. His administration also emphasized the practice of the LDS health code known as the Word of Wisdom. Until Grant's administration, adherence to the health code was not compulsory for advancement in the priesthood or for entrance to LDS temples. (Allen and Leonard, p. 524)
Grant died in Salt Lake City, Utah from cardiac failure as a result of arteriosclerosis. As the final surviving member of the church's Council of Fifty, his death marked the end of the organization.
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