Martha MacCallum (born January 31, 1964) is co-anchor on the top rated "America's Newsroom with Martha MacCallum & Bill Hemmer" on Fox News Channel, 9-11 EST. She joined the network in 2004. She previously hosted The Live Desk w/Martha MacCallum with Trace Gallagher at 1:00 p.m. ET. MacCallum is also often seen in primetime as fill-in Anchor for Megyn Kelly and Greta VanSustern, and has a weekly segment with Bill O'Reilly on The O'Reilly Factor.