Rubinstein was very widely published, essays and articles of his having appeared in various scholarly books and periodicals in Australia and overseas. Books of his have been translated into Finnish, Russian, French, Hebrew, Italian, Chinese, and Japanese. He is particularly known for his research on the wealth-holding classes in modern Britain, making use of probate and other taxation records, in such works as
Men of Property: The Very Wealthy in Britain Since the Industrial Revolution (1981) and
Capitalism, Culture and Decline in Britain, 1750–1990 (1991; Japanese translation, 1997). He has co-authored
The Richest of the Rich (2007) with
Philip Beresford, an account of the 250 richest-ever people in British history since the
Norman Conquest. He authored
The All-Time Australian 200 Rich List (2004). Rubinstein was also scholar of modern Jewish history. His books on that subject include
A History of the Jews in the English-Speaking World: Great Britain (1996) and the controversial work,
The Myth of Rescue (1997), which argues that the Allies could not have saved more Jews during the
Holocaust. Holocaust historian
David Cesarani called
The Myth of Rescue "a polemic that will quickly fade, while the monumental scholarship it seeks to denigrate will still be consulted by historians and students for years to come." Rubinstein in return called Cesarani's views of the subject "totally lacking in historical balance or context". Arthur M. Schlesinger Jr. was impressed with the book and with Rubinstein, with whom he dined on 1 August 1996, as recorded in Schlesinger's published journals (Schlesinger, Journals 1953–2000, Penguin Press, New York, p. 799). Rubinstein has appeared in several historical documentaries on the Holocaust, including the BBC's
Secrets of the Dead: Bombing Auschwitz, which premiered in the United States on the PBS network in January 2020. Rubinstein was a regular contributor, on Jewish and many other topics, to the conservative Australian intellectual and cultural magazine
Quadrant. Calling him "a towering figure" an obituary in the
Australian Jewish News noted that "Beyond academia, Rubinstein was a powerful voice in public discourse. A regular contributor to both Jewish and mainstream media, he fearlessly advocated for Jewish causes, courting controversy with his conservative political views. His intellectual curiosity, for Jewish history and culture, made him a uniquely influential figure in Australian Jewish life." (Bruce Hill, "Prominent Jewish Historian," Australian Jewish News, 11 July 2024. Rubinstein also researched topics discussed by amateur historians but ignored by academics. His
Shadow Pasts (2007) examines such topics as the
assassination of President Kennedy,
Jack the Ripper, and the
Shakespeare authorship question. He also explored the topic of who wrote Shakespeare's works in a book he co-authored with Brenda James,
The Truth Will Out (2005), which hypothesizes that
Henry Neville (c. 1562–1615), an Elizabethan Member of Parliament and Ambassador to France,
was the real author of Shakespeare's works. ==Personal life and death==