He was particularly noted for his work on the life of Anne Boleyn, the second wife and queen of King Henry VIII of England. His theories on her life drew him into fierce debate with the American historian Retha Warnicke, who wrote The Rise and Fall of Anne Boleyn in 1989 to challenge Ives's findings. He began researching Anne Boleyn about 1979, publishing the results in 1986. The biography, Anne Boleyn, was modified and expanded for re-publication in 2004 under the new title of The Life and Death of Anne Boleyn. In 2009, he published a study of Lady Jane Grey and the circumstances of her accession and downfall.
