John R. Hendricks

In 2004, Hendricks was unable to continue with his mathematical work due to ill health. He died in Victoria in 2007, aged 77.

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.

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 continued his work with magic hypercubes, achieving during this time: the first perfect magic tesseract (order 16), in April 1999; the first order 32 perfect magic tesseract; the first inlaid magic tesseract (order 6 with inlaid order 3) in October 1999; and the first bimagic cube (order 25), June 2000.

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.

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.

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.

Hendricks was born in Regina, Saskatchewan, in 1929, moving with his family to Vancouver, British Columbia at an early age.