One of the most prolific end-times-focused theologians in America today, Mark Hitchcock has written over 20 books on the subject. Some have been in collaboration with prominent names in the field like Thomas Ice, and his work has received endoresements from the authors of the Left Behind novels.
Hitchcock's most recent book came out as recently as this past June; and in recent works he's one of a few evangelicals to address the coming close of the Mayan calendar (which he approaches skeptically, but seems to feel that the 2012 phenomenon could dovetail with a Christian apocalyptic perspective).
Profile of Mark Hitchcock from RaptureReady.com
