Joji Tani (Japanese: 谷譲治, Hepburn: Tani Jōji), known as Screaming Mad George (October 7, 1956 - February 10, 2026), was a Japanese special effects artist, film director, and former musician. He was born in Osaka, Japan, and emigrated to the United States, where he became known for his surreal, grotesque and gory special effects. He collaborated with director and producer Brian Yuzna on many films.

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Screaming Mad George was a Japanese special effects artist and filmmaker who emigrated to the United States and became celebrated for his grotesque practical effects in cult horror cinema.
He is widely known for creating extreme practical creature effects and gore for features such as The Guyver and Society. Full schedule on Mood.
He specializes in surreal, visceral body horror and inventive practical makeup effects that blend science fiction with grotesque artistry.