Betty Behrens

Behrens then turned to a new topic, the French Ancien Régime and the French Revolution. She wrote attacks on the prevailing Marxist view of the causes of the revolution. In 1967, she published her magnum opus, The Ancien Régime. The book brought her short-term fame and a place among the Anglo-American intellectual élite. That year, she also moved from Newnham College to Clare Hall, a newly founded postgraduate-only college of the University of Cambridge. She retired from full-time academia in 1972, but continued to be a active academic as a fellow emerita of Clare Hall from 1972 to 1986. Her final book, Society, government and the Enlightenment: the experiences of eighteenth-century France and Prussia, was published in 1985; she was eighty-one.

In 1966, Behrens married E. H. Carr, a fellow historian and former diplomat. By the time of his death 1982, they had been living apart for a number of years.

Having returned to the United Kingdom, Behrens held research posts at Bedford College, London and at University College, Oxford. In 1935, she was elected a Fellow of Newnham College, Cambridge. Additionally, she was appointed an assistant lecturer in the Faculty of History, University of Cambridge in 1938 and promoted to lecturer the following year. Her research in the mid-1930s was focused on Henry VIII, and she published academic papers on this period including on his divorce and on resident diplomats. Her interests moved to later English history and she published an article on Charles II in 1941.

In 1923, Behrens matriculated into Lady Margaret Hall, Oxford to study modern history. She graduated in 1926 with a first class Bachelor of Arts (BA) degree. She was awarded a Commonwealth Fellowship to Radcliffe College, a women's liberal arts college in Cambridge, Massachusetts, United States, in 1928.

Catherine Betty Abigail Behrens (24 April 1904 – 3 January 1989), known as Betty Behrens and published as C. B. A. Behrens, was a British historian and academic. Her early interests included Henry VIII, Charles II, and the early modern period of English history, with her later research focused on the Ancien Régime (the Kingdom of France from the Middle Ages to the French Revolution). She was elected a Fellow of Newnham College, Cambridge in 1935, and moved to become a Fellow of Clare Hall, Cambridge after the publication of The Ancien Régime (1967). She "achieved an international reputation" with The Ancien Régime, with reviews describing it as "remarkable and absorbing" and "a lively, thought-provoking essay in historical revision".

Behrens was born on 24 April 1904 in London, England. Her father was Noel Edward Behrens (1879–1967), a Jewish civil servant and banker who had inherited a large amount of money from his father. Her mother Vivien Behrens (1880–1961), the daughter of Sir Cecil Coward, was a Christian. She was educated at home by a series of governesses and never attended school. She spoke French and English from an early age and later added German.