Dan (rank) is by far the most recognizable symbol to the general public. The highest dan ranks are sometimes reserved for the founder or leaders of a style and only high-ranking students can be promoted to them. For example, only five living people hold a tenth dan in judo and only about thirty-five worldwide have been promoted to the rank since its inception; of those 10th dan promotions only fifteen were conferred by the Kodokan, all of them to Japanese judoka. This has led to upper level ranks becoming extinct in some arts. In other styles, the dan ranks are not the
Judo in Canada aspects of Judo. The most complete history of Canadian Judo is Glynn Leyshon's "Judoka: the history of Judo in Canada" (1998). However, while Leyshon is Professor Emeritus of Kinesiology at the University of Western Ontario, "Judoka" is a popular history published by Judo Canada rather than an academic study. Anne Doré's article "Japanese-Canadian Sport History in the Fraser Valley: Judo and Baseball in the Interwar Years" (2002) and Joseph Svinth's book "Getting a Grip: Judo in the Nikkei Communities of the Pacific Northwest, 1900-1950" (2003) both address the history of Judo in British Columbia. Luiz Moraes' PhD thesis in Education