Mark Knoller is a journalist with CBS best known for his reporting on the White House. He has covered every American president since Gerald Ford, and started gathering statistics on the presidents' daily activities in 1996. Wikipedia*
On the C-SPAN Networks:
Mark Knoller has 49 videos in the C-SPAN Video Library; the first appearance was a 1998 Call-In. The year with the most videos was 2010 with 26 videos. The year with the highest average number of views per program was 2009 with an average of 2,188 views per program. Most appearances with Robert Gibbs (39), Jake Tapper (34), Chip Reid (28). Most common tags: Washington Politics, Health Care, Afghanistan.