David Asman has been elevated to head of Fox News Channel’s documentary unit.

Asman will also continue to host Forbes on Fox on the weekends, in addition to a series of investigative specials.

During his Fox News tenure, he has hosted U.N. Blood Money, a series of three special programs examining the oil-for-food controversy. He also anchored coverage of the terrorist attacks of Sept. 11, 2001, playing a key role in the network’s daily coverage of the war on terror.