Conversation so far:
When did Bernard begin doing research?
He began his research career with the study of medieval Arab, especially Syrian, history.
Where did he do his reserach?
CANNOTANSWER.
did he have anything published?
Lewis wrote several influential books accessible to the general public.
did any of his research win awards?
articles that Lewis published over the next several years revolutionized the history of the Middle East by giving a broad picture of Islamic society.
Did he work with anyone?
CANNOTANSWER.
Did anyone influence his work?
He began his research career with the study of medieval Arab.

Question: Did he have any problems during research?
Self-contained rewrite: Did Bernard Lewis have any problems during research of medieval Arab?