Who led the Mormons to the Great Salt Lake?

Brigham Young was the Prophet of the Church of Jesus Christ of the Later Day Saints by the time the Mormon migration reached Utah. Prior to Brigham Young, Joseph Smith, originator of the LDS led the Mormons until he was killed by a mob in Carthage, Illinois, in 1844.
The first group of Mormon Pioneers was lead to the Great Salt Lake by Brigham Young. Later groups were lead by experienced trail guides who had traveled with Brigham Young previously.