John Plaistowe Horder (9 December 1919 – 31 May 2012) was an English physician who worked as a general practitioner (GP).

[3] Prior to having her children, Horder's mother Emma, played the violin and attended the Royal Academy of Music.

His early education and schooling up until age 19, was concentrated on the humanities and, as a result, when he went up to Oxford University, he started as an open classical scholar, with breaks in Paris studying music.

Collings's report, which revealed stretched GPs in deprived, often sub-standard buildings with poor clinical standards.

This was also a time when Horder was briefly chairman of the local division of the British Medical Association causing him to become increasingly disillusioned with general practice.

[3] In 1952, as a result of the formation of the new College for General Practitioners founded particularly by John Hunt and Fraser Rose, Horder became one of its Foundation Associates.

[3] For a short time, Horder was involved with Michael Balint's research at the Tavistock, the report of which was published in The Doctor, His Patient and the Illness in 1957.

[3] In 1974, he co-founded the Leeuwenhorst European Study Group that produced an agreement about the role of general practice.

[1][7] On taking up the role of RCGP president, Horder discovered that for young GPs, the college had uncertain significance and questionable meaning, with time constraints being a key issue.

[2] He advised the Department of Health and Social Security on matters relating to general practice, a position he held for 6 years.

He was originally a Jungian and sceptical of chemically altering the mind but later became an advocate for anti-depressants, particularly monoamine oxidase inhibitors (MAOI).