KNB EFX Group is an American special effects company that specializes in prosthetic makeup, animatronics, and other practical effects. It was founded in 1988 by Robert Kurtzman, Greg Nicotero, and Howard Berger, though Kurtzman left in 2003. After establishing a reputation for gory effects in horror films throughout the late 1980s and early 1990s, they broadened to performing animatronics and makeup effects for mainstream comedy and drama films. Their work on The Chronicles of Narnia: The Lion, the Witch and the Wardrobe and The Walking Dead have netted them multiple awards and nominations.