After university, Rubinstein became an editor at
Gollancz. He encouraged the firm to publish
Kingsley Amis's first novel
Lucky Jim (Rubinstein and Amis had become acquainted at Oxford). He also expanded the firm's range of authors, adding science fiction written by
J. G. Ballard,
Robert Silverberg and
Robert Heinlein. He worked at Gollancz for 13 years, from 1950 to 1963, and became a director in 1952, effectively becoming Victor Gollancz's deputy in 1954 after Sheila Hodges left. Eventually, Victor Gollancz appointed his daughter
Livia Gollancz to succeed him in running the business. Conflicts with Gollancz led him to leave his job after 13 years. Rubinstein left to work at
The Observer from 1963 until 1965, and served as the deputy editor of the newspaper's colour magazine when it launched in 1964. He then became a literary agent at the long-established firm A. P. Watt, where he represented many successful clients, including
Quentin Blake,
Nadine Gordimer,
Jan Morris,
Geoffrey Moorhouse,
P. G. Wodehouse, and the estates of
G. K. Chesterton,
Robert Graves,
Rudyard Kipling,
Somerset Maugham,
H. G. Wells, and
W. B. Yeats. For
Michael Holroyd, he secured an advance of more than £600,000 from
Chatto & Windus in 1987 for a four-volume biography of
George Bernard Shaw. He also acted as agent for
John Colville, private secretary to Winston Churchill, who published his memoirs
The Fringes of Power: Downing Street Diaries 1939-1955. He compiled an anthology,
The Complete Insomniac, which was published in 1974, and in 1978, he founded and compiled
The Good Hotel Guide, published by
Which? alongside
The Good Food Guide founded in 1951 by
Raymond Postgate. Rubinstein retired from AP Watt in 1992, but continued to work as a literary agent independently, controversially acting for
Mary Bell, the 1960s child murderer, whose biography
Cries Unheard written with
Gitta Sereny was published in 1998. He was a member of the council of the
Institute of Contemporary Arts from 1976 to 1992, he was a trustee of the
Open College of the Arts from 1987 to 1996. ==References==