Orson Pratt served as an apostle for many years. Born in New York state, he gained a solid education and became a teacher. He was baptized in 1830, at nineteen, following his brother Parley's conversion and subsequent missionary efforts. He performed many missionary labors in the United States, Scotland, England, and on the continent, crossing the ocean sixteen times and arranging for the shipping to Zion of thousands of newly converted Saints. Pratt was an excellent astronomer and was recognized as a leading intellect in the Church, he published a number of scientific studies and left in manuscript at his death an elaborate work on differential calculus. Pratt was the author of numerous theological treatises.
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