https://www.mormon.org/faq/founder-of-mormon-church
Who founded Mormonism and The Church of Jesus Christ of Latter-day Saints?
In the spring of 1820, a 14-year-old boy named Joseph Smith went into a grove of trees near his home in Palmyra, New York, and prayed to learn which church he should join. In answer to his prayer, God the Father and His Son, Jesus Christ, appeared to him, just as heavenly beings had appeared to prophets like Moses and Paul in biblical times. Joseph learned that the Church originally organized by Jesus Christ was no longer on the earth.
Joseph Smith was chosen by God to restore the Church of Jesus Christ to the earth. During the next 10 years, Joseph was visited by other heavenly messengers, translated the Book of Mormon by the power of God, and received divine authority to organize the Church. The Church was organized in Fayette, New York, on 6 April 1830, under the leadership of Joseph Smith. It has grown to an organization with members and congregations throughout the world.