Keiichi Yamada (山田恵一, Yamada Keiichi, born November 30, 1964), better known as Jushin Liger (獣神ライガー, Jūshin Raigā) and later Jushin Thunder Liger (獣神サンダー・ライガー, Jūshin Sandā Raigā) is a Japanese retired professional wrestler and mixed martial artist who is best known for his work in New Japan Pro-Wrestling (NJPW), where he is the longest-tenured member of the roster, having remained with the company since his debut in 1984 until his retirement in January 2020. Throughout his career, which spanned three-and-a-half decades, he wrestled over 4,000 matches and performed in major events for various promotions across the globe, including America's WWE.