Denis Brian (11 December 1923 – 30 May 2017) was a Welsh journalist and writer, notable for writing the 1996 biography Einstein: A Life.
He graduated from Ravensbourne School, Bromley in 1939 and then worked as a reporter for the Irish News Service in Fleet Street for two years.
Upon reaching the age of eighteen, he joined the Royal Air Force; after two years' training (mostly in Canada) he became a Lancaster bomber pilot with the rank of flight lieutenant.
After WWII he studied playwriting at the Royal Academy of Dramatic Art and several of his plays were produced in English theatres.
In 1957 Brian emigrated to the United States, where he worked as a freelance writer and editor for several publications, including the Writer's Literary Agency.