Tak Sakaguchi is a Japanese actor, director, fight choreographer, stuntman and martial artist. He is best known for his role in Ryuhei Kitamura's cult film, Versus. Since his debut, Sakaguchi has worked with Kitamura several times, often appearing alongside fellow Kitamura staple Hideo Sakaki. He has also worked with frequent Kitamura collaborators Yudai Yamaguchi and Yuji Shimomura. Sakaguchi is a talented martial artist, and most often appears in films featuring copious fight scenes, usually performing all of his own stunts. He is purportedly skilled in Bajiquan, Shorinji Kempo, Boxing, Kickboxing, and while recently filming Re:Born learned the tactical martial art Zero Range Combat developed by Yoshitaka Inagawa.

Ryuhei Kitamura is a Japanese film director, producer, and screenwriter. Kitamura relocated to Sydney, Australia at age 17 and attended a school for visual arts for two years. In 1997, Kitamura directed and produced the short film Down to Hell, which received a positive response from students, teachers, and an award which motivated Kitamura to seriously pursue a film career. He went on to independently finance and direct his feature film debut Versus (2000). The film proved to be successful within the film festival circuit and opened doors for Kitamura to direct more high-profile films such as Alive (2002), Sky High (2003), Godzilla: Final Wars (2004), The Midnight Meat Train (2008), No One Lives (2012), the live-action adaptation of Lupin the 3rd (2014), and several other Japanese and Hollywood productions.