Keith Barry Critchlow (16 March 1933 – 8 April 2020) was a British artist, lecturer, author, sacred geometer, professor of architecture, and a co-founder of the Temenos Academy in the UK.

[7]While in Ghana, Critchlow and his colleague Michael Ben-Eli studied Fuller geometry and experimented in the construction of geodesic domes using local building materials, such as palm, bamboo and aluminium.

[9] Critchlow and colleagues experimented in the use of lightweight materials for the construction of domes, including Tri-Wall Pak corrugated board, to aid in transport and assembly by unskilled labour in disaster areas.

[14] His other architectural works include, the Lindisfarne Chapel in Crestone, Colorado, in the United States with a special design for the vaulting of the dome,[15] and a hospital, the Sri Sathya Sai Institute of Higher Medical Sciences in Puttaparthi, India.

King Hussein of Jordan launched a 30-year search, including international competitions, to find a sufficiently qualified person to re-design the intricate patterns of the minbar.

The competition was finally won by Minwer Al-Meheid[17] who was inspired to make his submission after spending a year studying Critchlow's work: Seemingly, the ancient knowledge of how to map the structure geometrically had been lost.

Critchlow was president of the Temenos Academy,[19] a co-founder of Research into Lost Knowledge RILKO and founder of Kairos, an educational charity which investigates, studies, and promotes traditional values in art and science.