Bernard is a British historian who specializes in the reign of King Henry VIII, specifically the English Reformation of the 1530s – both in England and globally – and the "reign" of Anne Boleyn.
He is most famous for his arguments for the strength of Henry VIII as a ruler not controlled by faction, and for his theory that Anne Boleyn was guilty of adultery in 1536, based on a poem by Lancelot de Carles.
He is commonly pitted up against David Starkey and Eric Ives, who forcefully present the opposite argument.
Since 1981, he has taught at the University of Southampton as Professor of Early Modern History.
He works alongside a former student, Mark Stoyle.
In 2001–11 he was editor of the English Historical Review.