Who is Kenji Tomiki

Kenji Tomiki Aikido was used as the first sport Aikido.

Kenji Tomiki first studied judo under Jigoro Kano, the founder of Kodokan judo, and began practicing aiki-jujutsu under Morihei Ueshiba with the encouragement of Kano himself.  Kenji Tomiki developed his efficient aikido training system applying the twin principles of judo, "Maximum Efficiency with Minimum Effort" and "Mutual Benefit" enunciated by Professor Jigoro Kano.  also Kenji Tomiki was one of O-sensei's first students, already an 8th-dan Judo expert who trained with Judo founder Jigoro Kano before practicing Aikido, and eventually recieved an 8th dan from O-sensei himself.

Founders of their own schools of aikido are Gozo Shioda and Kenji Tomiki, who were among Ueshibas first students.  The aikido that was developed along modern lines by Kenji Tomiki from the old aikido that was developed by Morihei Ueshiba from the aiki-jujutsu techniques of his master,

Sokaku Takeda.  Some of the prewar students who did filter back to the Hombu Dojo were Kenji Tomiki, Gozo Shioda, Koichi Tohei, and Osawa and Okumura.  One of the other big changes in Aikido history occured during O Sensei's life when Kenji Tomiki proposed "rationalizing" Aikido training using Kata and Competition.