John Graham-Cumming is a British software engineer and writer[4] best known for starting a successful petition to the Government of the United Kingdom asking for an apology for its persecution of Alan Turing.

[6]As of 2020[update], Graham-Cumming is Chief Technology Officer at Cloudflare;[7][8][9] previously he co-founded Electric Cloud.

[10] Graham-Cumming is the original writer of POPFile, an open-source, cross-platform, machine learning email spam filtering program.

[19] In 2014, he launched the MovieCode site on Tumblr, which aims to connect film screenshots to specific extracts of source code.

[20] Some of the films and source code covered on the MovieCode website are explored in depth in the form of videos on his site Behind The Screens.