A Kenyan-born American writer, he is particularly known for his award-winning biographies of Ronald Reagan and Theodore Roosevelt. He also published a 2005 work on the life of composer Ludwig van Beethoven.
Wanting to become a concert pianist, he studied music at Rhodes University in South Africa before dropping out of college to move to London.
His controversial biography of Ronald Reagan was entitled Dutch: A Memoir of Ronald Reagan.
The son of a South African pilot, he was born in Nairobi, Kenya. He was married to Sylvia Jukes Morris from 1966 until 2019.
He wrote three biographies of Theodore Roosevelt; the first of these won the Pulitzer Prize in 1980.