Green worked for Grindlays Bank both in London and Uganda, and as an export manager for British manufacturers. He has worked as an independent historian for more than three decades. His notable work on Black British history includes research into the life of composer Samuel Coleridge-Taylor that culminated in the 2011 biography Samuel Coleridge-Taylor, a Musical Life. Green edited trumpeter Leslie Thompson' autobiography, first published in 1985 and reissued as Swing from a Small Island - The Story ofLeslie Thompson by Northway Publications in 2009. Green has written more than 30 articles for the Oxford Dictionary of National Biography. Other publications to which he has contributed include The Oxford Companion to Black British History, The Grove Dictionary of Jazz, The Journal of Caribbean History, Black Music Research Journal, Black Perspective in Music, New Community, Storyville and History Today. In History Today in 2000, he argued that the black presence in the UK before 1940 had largely been ignored by historians. He is a regular participant in seminars and conferences. Green has also been active in trying to trace fugitive slaves who escaped from the US to the UK. In 2015 he was nominated for a Grammy for work on the 44-CD boxed set with two books, Black Europe, which rescued recordings made in Europe by people of African descent prior to 1928. Green lives in East Grinstead, Sussex. A collection of Green's research papers, reference material, and papers of the Barbour-James family that he acquired after the death of Amy Barbour-James, are held at the Black Cultural Archives.
Coleridge-Taylor: A Centenary Celebration, London: History and Social Action Publications, 2012.
Black Americans in Victorian Britain, Pen & Sword, 2018.
Contributions in collections
"Thomas Lewis Johnson : the Bournemouth Evangelist"; "George William Christian : Liverpool Merchant"; "Dr J. J. Brown of Hackney ", in Rainer Lotz and Ian Pegg, Under the Imperial Carpet: Essays in Black History 1780–1950.
"The Negro Renaissance and England", in Samuel A. Floyd, Jr., Black Music in the Harlem Renaissance.
"A Revelation in Strange Humanity: Six Congo Pygmies in Britain, 1905–1907", in Bernth Lindfors, Africans on Stage. Studies in Ethnological Show Business.
Selected articles in journals
"Roland Hayes in London, 1921", Black Perspective in Music, New York.
"'In Dahomey' in London in 1903", Black Perspective in Music.
"The Jamaica Native Choir in Britain, 1906–1908", Black Music Research Journal.
"Samuel Coleridge-Taylor: The Early Years" and "Requiem – Hiawatha in the 1920s and 1930s", Black Music Research Journal, a volume edited by Jeffrey Green.
"Black Musical Internationalism in England in the 1920s", with Howard Rye, Black Music Research Journal.
"Memories of the SSO: Descendants Speak" and "Edmund Jenkins of South Carolina", Black Music Research Journal, a volume dedicated to the Southern Syncopated Orchestra.