Conversation so far:
When did Bernard Lewis begin doing research?
Bernard Lewis's first book, Origins of Isma'ilism: A Study of the Historical Background of the Fatimid Caliphate was published in 1940.
Where did Bernard Lewis do his research?
Bernard Lewis switched to the study of the Ottoman Empire, while continuing to research Arab history through the Ottoman archives which had only recently been opened to Western researchers.
did Bernard Lewis have anything published
Bernard Lewis is a widely read expert on the Middle East and is regarded as one of the West’s leading scholars of that region.
did any of Bernard Lewis' research win awards?
In 1990, the National Endowment for the Humanities selected Bernard Lewis for the Jefferson Lecture, the U.S. federal government's highest honor for achievement in the humanities.
Did Bernard Lewis work with anyone?
Bernard Lewis developed ties with governments around the world: during her time as Prime Minister of Israel, Golda Meir assigned Lewis' articles as reading to her cabinet members
Did anyone influence Bernard Lewis' work?
Bernard Lewis was born to Jewish parents, Harry Lewis and Jane Levy, in Stoke Newington, London. He became interested in languages and history while preparing for his bar mitzvah.
Did Bernard Lewis have any problems during research?
After 1948, scholars of Jewish origin found it more and more difficult to conduct archival and field research in Arab countries, where they were suspected of espionage.

Question: When did he stop research?
Self-contained rewrite: When did Bernard Lewis stop research?