Professor Elvin Gadd, often shortened to Professor E. Gadd, is the scientist first appearing in Luigi's Mansion and founder of Gadd Science, Incorporated. He always speaks in ambiguous gibberish (supplied by Kazumi Totaka, who took inspiration from Animal Crossings "Animalese" when inventing the voice). His name comes from the minced oath "egad!", something that one says in amazement or shock.