Jim Arvanitis is a Greek-American martial artist and professional trainer of Mixed Martial Arts/Hybrid Reality Combat based on the pankration model, and author of several books and videos relating to pankration. He is considered Pankration's Renaissance Man and the founder of Neo-Pankration, a blend of the remnants of the ancient pankration and elements found in modern sources such as Western boxing, savate, Greco-Roman wrestling, Muay-thai, and combat judo. He holds the rank of Great Grandmaster, 11th Dan from the World Pankration Dan Ranking.