In 1980, Johnson-Davies completed a
PhD and then went on to join
Acorn Computers, developers of the
BBC Micro. Johnson-Davies was the founder and managing director of
Acornsoft, publisher of video games such as
Elite and the View business software range by
Mark Colton. In 1982, Johnson-Davies wrote
Practical Programs for the BBC Computer and Acorn Atom. In 1986, he left Acornsoft and established Human Computer Interface shortly afterwards. The company developed Macintosh-based programs compatible with BBC BASIC and BBC Micro software, disks, and networks, including for
Hitachi and
Royal Mail. Johnson-Davies also contributed several articles to
Acorn User. In May 1986, he discussed the graphical potential of
Benoit Mandelbrot’s mathematics in "Join the
Mandelbrot Set". In July 1986, Johnson-Davies applied the
Newton-Raphson method for finding the roots of an equation to create images that display
fractal behavior, featured in "Back to the Roots." In the October 1986 issue, he wrote "Spider Power" alongside quantum computing pioneer
David Deutsch. In 2000 he created
Identifont, a website which identifies typefaces from provided samples. Johnson-Davies then went on to develop Fontscape (copyrighted in 2000). ==References==