Morihiro Saito was an aikido teacher with many students around the world. He began his aikido training under the founder of aikido, Morihei Ueshiba, in Iwama in 1946 after having practiced some kendo, judo and karate. Although other students such as Koichi Tohei trained with Ueshiba for more years than Saito did, Saito's work allowed him to train almost as an uchideshi, for long periods as the only student. Wikipedia
The definitive Wikipedia entry for Morihiro Saito. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Morihiro_Saito