In 1965, Widgery met Allen Ginsberg, then visited Watts, where he encountered the civil rights movement, followed by Cuba. On return to Britain, he studied medicine at the Royal Free Hospital Medical School before writing for the New Statesman and Oz magazines, becoming co-editor of Oz during 1971.
Widgery joined the International Socialists in 1967, remaining in the group when it became the Socialist Workers Party in 1977. He began working at Bethnal Green Hospital in 1972, and later in the decade he published his first book, The Left in Britain, 1956–68.
His books include The Chatto Book of Dissent (1991), an anthology of dissident writings co-edited with Michael Rosen, Some Lives!: A GP's East End (1991), the story of his experience as a doctor in London's East End, The National Health: A Radical Perspective, and Beating Time (1986), an account of the Rock Against Racism movement of the late 1970s.
When Widgery died, aged 45, excess alcohol, barbiturates and pethidine were found in his bloodstream, but it is not known whether this was an accidental or intentional overdose. One obituary described Widgery as "a radical humanist intellectual on permanent loan to revolutionary socialism."
- Widgery, D. (1976), The Left in Britain, 1956-68 (Peregrine Books)
- Widgery, D. (ed) (1980), The Book of the Year: September 1979 to September 1980 (Inklinks)
- Widgery, D., The National Health: A Radical Perspective
- Widgery, D. (1986), Beating Time
- Widgery, D. (1989), Preserving Disorder (Essays on Society & Culture) (Pluto Press)
- Widgery, D. and Rosen, M (eds) (1991), The Chatto Book of Dissent (Chatto)
- Widgery, D. and Shelton, S. (1991), Some Lives!: A GP's East End, London: Sinclair Stevenson.
- Widgery, D. (1991), Marketa Luskacova: Photographs of Spitalfields (Whitechapel Art Gallery)
- Widgery, David John Turner. Oxford Dictionary of National Biography.
- "David Widgery". National Portrait Gallery. Retrieved 9 March 2009.
- Taylor, Ian; Taylor, Laurie (1973), "Conference papers", in Taylor, Ian; Taylor, Laurie, Politics and deviance, Harmondsworth: Penguin, p. 213, ISBN 9780140216868.
- Le Fanu, James (July 2005). "Confronting an ill society". Journal of the Royal Society of Medicine. Sage. 98 (7): 332–333.
- Light, Bob (November 1992). "The human face of revolution". Socialist Review. 158 (24). Archived from the original on 23 March 2012.
- "Marxist Writers: David Widgery". marxists.org. Marxist Internet Archive.
- "The poetics of propaganda: David Widgery". dkrenton.co.uk. D.K. Renton. Archived from the original on 23 May 2013.
- Rosen, Michael. "David Widgery 1947 - 1992, Writer, Journalist, Doctor and Activist - An Obituary" – via John & Noelene Gillatt.
- Foot, Paul (November–December 1992). "David Widgery (obituary)". New Left Review. New Left Review. I (196).
- Harman, Chris (7 November 1992). "Dave Widgery: Carrying the spirit of revolt". Socialist Worker. 1316 (7): 13.
- Foot, Paul (12 December 1992). "Inspiring Memory". Socialist Worker: 49–50.
- Hayes, David (28 October 2012). "David Widgery: Against Oblivion". openDemocracy. openDemocracy Foundation for the Advancement of Global Education.