In 1985 Porter became chairman of
Verifone and remained a director until the company was sold to
Hewlett-Packard in 1997. A key plank in John Porter's empire was said in 2000 to be the fortune he had made out of the US computer company
Telos, based in Virginia, which has close ties to the Pentagon. Telos was originally called C3, and specialised in the communication systems that formed the backbone of the US Army. In 2016 Porter joined the Board of Trustees of UK charity
Paintings in Hospitals. Porter died of
lung cancer on 10 November 2021, aged 68, after a 5-year illness. ==References==