Keiichi Yamada (山田恵一 Yamada Keiichi) better known as Jyushin Liger (獣神ライガー Jūshin Raigā) and later Jyushin Thunder Liger (獣神サンダー・ライガー Jūshin Sandā Raigā) is a Japanese professional wrestler and former mixed martial artist who primarily works for New Japan Pro-Wrestling. Throughout his career, which has spanned more than three decades, he has wrestled many of the world's top wrestlers and has performed in major events for promotions across the globe. He is frequently cited as one of the greatest and most revolutionary junior heavyweights of all time.