He was co-author with Namier of a biography of Charles Townshend, and author of The Chatham Administration, a study of politics in the early years of George III's reign.
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He studied history at the University of Manchester under Lewis Namier:, and in 1951 became Namier's principal assistant for the History of Parliament.
He was on the personal staff of Field Marshal Sir Harold Alexander (later created Lord Alexander).
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It was later reported that while the lower Falls was under curfew and the streets emptied of people, the Army had driven two Unionist ministers, John Brooke and William Long, through the area in armoured vehicles.
Egan's son, John Brooke-Little, founded the Society of Heraldic Antiquaries (now known as The Heraldry Society) in 1947, and Egan became managing editor of its journal The Coat of Arms.
:* Mary Brooke was the daughter of John Brooke, 7th Baron Cobham of Cobham, Kent, an important landowner in the vicinity of Blagge's Kent holdings.
He was the basis for the character John Brooke in Little Women and Little Men.