Over its nearly two-century history, the LDS church has developed a complicated bureaucracy to oversee what is now a worldwide religion. While every active adult Mormon holds a calling in the church, only those at the very top serve in their positions on a full-time basis. And because only men can receive the LDS priesthood, the top of the hierarchy is entirely male. Read David Haglund's "Case of the Mormon Historian."
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Correction, Nov. 1, 2012: This chart originally depicted the general officers for the LDS primary as men. They're women.