The description by "ElGringo," who posted the images on the "PR Watch" forum, says this:
"According to the White House website, this video is part of an exclusive presentation to celebrate the West Wing 100th Anniversary and, according to the State Department, was presented on November 13th, 2002." ~ El Gringo
http://www.prwatch.org/forum/showthread.php?t=5358------------
The images are from the "West Wing 100th Anniversary" video series. If the video was "presented" November 13, that would place Gannon at the White House in 2002.
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International Information Programs
U.S. Society, Values & Politics 13 November 2002
White House Celebrates 100th Anniversary of the West Wing
Life in the White House -- An exclusive presentation by whitehouse.gov
On November 13, to celebrate the West Wing's 100th anniversary, the White House unveiled "Life in the White House," an exclusive Web-based presentation of the rich history of the White House and West Wing.
The presentation offers Web-exclusive video tours of the White House led by President Bush, Vice President Cheney, Laura Bush, Lynne Cheney and other White House Officials. Articles and anecdotes highlight the history of the White House and West Wing, including features on family life, life in the Press Briefing Room, life in the Blue Room (the center of the house), and a look at art and furnishings of the State Floor in videos narrated by White House Curator William Allman.
http://usinfo.state.gov/usa/a111302.htm