Mr. Adler was a minor character in the horror novel, It. He was one of the many occupying security guards at Juniper Hill, a highly-secured mental asylum located in Derry, Maine. Along with his fellow enforcers Fogarty and Koontz, Adler would often cruelly punish his mental patients (most notably Henry Bowers) by striking and beating them with brass knuckles (usually using silver quarters).