Gregory "Greg" Abbey (born December 15, 1962 Great Falls, Montana), also known under the aliases Frank Frankson and John Campbell, is an American voice actor who is known for working with 4Kids Entertainment, DuArt Film and Video, NYAV Post and Central Park Media. He is best known for his roles of Tristan Taylor from Yu-Gi-Oh!, Yusei Fudo from Yu-Gi-Oh! 5D's and Raphael from Teenage Mutant Ninja Turtles.