John Robert Hendricks (September 4, 1929 – July 7, 2007) was a Canadian amateur mathematician specializing in magic squares and hypercubes. He published many articles in the Journal of Recreational Mathematics as well as other journals. Early life and career Hendricks was born in Regina, Saskatchewan, in 1929, moving with his family to Vancouver, British Columbia at an early age. He attended the University of British Columbia and graduated with a B.A. in mathematics. In the summer of 1951, he had just graduated from University, and was working in a fire-lookout tower near Campbell River, British Columbia, when his tower was surrounded by the largest forest fire in Canada up to then, and he only narrowly managed to escape. He began his career as a meteorology instructor in the NATO flight training program, and was subsequently employed for 33 years by the Canadian Meteorological Service, until his retirement in Winnipeg, Manitoba in 1984. Hendricks volunteered for groups including the Monarchist League of Canada and the Manitoba Provincial Council, Duke of Edinburgh's Award in Canada. He received the Canada 125 medal for his volunteer work. Amateur mathematician When he was 13, Hendricks started collecting magic squares. As his interest in mathematics grew, so did his love of magic squares, and cubes. His interest in magic squares led to higher dimensions: magic cubes, tesseracts, etc. He developed a new diagram for the four-dimensional tesseract. This was published in 1962 when he showed constructions of four-, five-, and six-dimensional magic hypercubes of order three. He later was the first to publish diagrams of all 58 magic tesseracts of order 3. Hendricks was also an authority on the design of inlaid magic squares and cubes (and in 1999, a magic tesseract). Following his retirement, he gave many public lectures on magic squares and cubes in schools and in-service teacher's conventions in Canada and the northern United States. He also developed a course on magic squares and cubes which he conducted for seven years at Acadia Junior High School in Winnipeg. Later years In April 1996, Hendricks and his wife Celia moved to Victoria, British Columbia. By this time, he was suffering from Parkinson's disease that meant he had difficulty walking or writing. He purchased a personal computer to help with his self-published work on magic hypercubes, which until this point he had carried out using only a programmable calculator. Despite his deteriorating health, Hendricks