Mark is Rory's art history teacher at Wexford Sixth Form. Right from the beginning of classes, he introduced himself to his students with his first name. Art history goes for three hours (divided by two ten-minute breaks) and is one of Rory's longest classes. However, Mark is quite laid-back for a high school teacher and usually allows his students to extend their breaks. When Rory runs away from one of Mark's art excursions to follow Boo, she first discovers that she has the Sight.

Mark appears in both The Name of the Star and in The Madness Underneath.

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