God has called prophets to lead His Church in our day, just as He did anciently. The current prophet and President of The Church of Jesus Christ of Latter-day Saints is Thomas S. Monson. He is assisted by two counselors — Henry B. Eyring and Dieter F. Uctdorf. Together, they make up the First Presidency of the Church (much like Peter, James, and John after Christ’s death). These men work together to follow the direction of Jesus Christ to lead the church.
Talk Source: http://mormon.org/faq/present-day-prophet