Masaaki Hatsumi is a Japanese martial artist and the founder of the Bujinkan, a global organization dedicated to the study of traditional Japanese martial arts. Born on December 2, 1931, he is known for his expertise in various disciplines, including Ninjutsu, which focuses on stealth and strategy. Hatsumi has trained in multiple martial arts styles and has been influential in promoting these practices worldwide. In addition to his martial arts career, Hatsumi is also an author and has written several books on martial arts philosophy and techniques. He emphasizes the importance of mental discipline and adaptability in martial arts training, encouraging students to develop their own unique styles.