subjects, his published columns appearing in popular periodicals such as The Daily Telegraph and The Spectator, amongst others. Since 1990, Roberts has addressed hundreds of institutional and academic audiences in many countries, including a lecture to former US president George W. Bush at the White House. A monarchist, Roberts described Prince Philip upon his death as "undoubtedly ... one of the reasons that the overwhelming majority of Britons today feel blessed that their country is a monarchy". He has appeared on US television during royal funerals and weddings. He first came to prominence in the United States due to acting as an expert on the funeral of Princess Diana in 1997, and he was later in a similar role during the CNN broadcast of the death of the Queen Elizabeth The Queen Mother and on the wedding of Charles, Prince of Wales, and Camilla, Duchess of Cornwall. In 2003, he presented The Secrets of Leadership, a four-part history series on BBC 2 about the secrets of leadership which looked at the different leadership styles of Winston Churchill, Adolf Hitler, John F. Kennedy, and Martin Luther King Jr. Roberts is a Director of the Harry Frank Guggenheim Foundation in New York City, a founder member of José Maria Aznar's Friends of Israel Initiative, and chaired the Hessell-Tiltman Award for Non-Fiction in 2010. Roberts is a judge on the Elizabeth Longford Historical Biography Prize. He chaired the Conservative Party's Advisory Panel on the Teaching of History in Schools in 2005, and is a Fellow of the Royal Society of Literature. He has also been elected a Fellow of the Napoleonic Institute and an Honorary Member of the International Churchill Society. He is a Trustee of the Margaret Thatcher Archive Trust and of the Roberts Foundation. During the autumn of 2013, Roberts served as the inaugural Merrill Family visiting professor in history at Cornell University. He taught a course entitled "Great European Leaders of the 19th and 20th Centuries and their Influence on History." He has additionally spoken in many other American universities such as the University of Montana. Disputes and criticism Although Roberts's 2006 work A History of the English-Speaking Peoples since 1900 won critical acclaim from some sections of the media, The Economist drew attention to some historical, geographical, and typographical errors, as well as presenting a generally scathing review of the book. The newspaper referred to the work as "a