Dōshu (道主 / どうしゅ) literally translates as 'Master of the Way'. It is the title denoting the head of the Aikikai. Although the same term could be used as a title within other disciplines, in Japanese its most common meaning is specific to the Aikikai Foundation.
Moriteru Ueshiba (植芝 守央 Ueshiba Moriteru, born April 2, 1951) is a grandson of Morihei Ueshiba, founder of aikido, and son of Kisshomaru Ueshiba. Ueshiba Moriteru is the third and current Doshu (hereditary head) of the Aikikai Foundation and Aikido all over the world.
Video: International Aikido Federation (IAF)
Video: International Aikido Federation (IAF)