> Often playing heavies and villains, Katt worked with Richard Linklater, appearing in “Waking Life,” “SubUrbia” and “School of Rock.” For director Steven Soderbergh, he appeared in “The Limey” as Stacy the Hitman, as Hitler in “Full Frontal,” and had one of his final roles in “Behind the Candelabra.” Christopher Nolan cast him in “Insomnia” and “The Dark Knight,” in which he played a S.W.A.T. team member.

> On “Boston Public,” Katt played the popular geology teacher Harry Senate, who taught troublemaker kinds in “the dungeon.” David E. Kelley arranged for him to be written out of the show after suffering a mental breakdown so Katt could pursue his movie career after three seasons.

> In Linklater’s “Dazed and Confused,” Katt played the tough guy Clint Bruno, who threatens Mike (Adam Goldberg) and then beats him up. He went on to appear in Gregg Araki’s “Doom Generation,” Kathryn Bigelow’s “Strange Days,” in Neil Jordan’s “The Brave One” and in two Joel Schumacher movies, “A Time to Kill” and “Batman & Robin.”

> Katt was memorable in Christopher McQuarrie’s directorial debut, the 2000 Western action film “The Way of the Gun,” as a bodyguard who gets injured in a shootout.

> He also provided the voice of Atton Rand for the “Star Wars: Knights of the Old Republic II – The Sith Lords” video game.