Carl Carlson, MPhys is a fictional character in the animated television series The Simpsons. Along with Lenny, Carl is not just Homer's co-worker (sometimes identified as Homer's supervisor) at the Springfield Nuclear Power Plant but one of his best friends since childhood, and he likes to call himself “an urban Lenny”. He also attended Springfield A&M University. He was born in Iceland.
Carl is an Icelandic American, a Buddhist with a master's degree in nuclear physics, fond of bowling and drinking at Moe's Tavern. Carl demonstrates his talent for science in the episode Fat Man and Little Boy. Carl is frequently said to be among the most attractive men in Springfield, notably in Principal Charming where Homer concludes that Carl is too attractive for Selma. According to “They Saved Lisa's Brain”, he might be diabetic.