Birch was a prolific author whilst in his position as curator of western manuscripts at the
British Museum. He was a
Fellow of the Society of Antiquaries, Member of the
Royal Academies of Seville and
Turin and honourable member of the
Hispanic Society of America. He held the positions of Honourable Secretary, Editor, vice-president, and Treasurer for many years of the
British Archaeological Association. During his tenure at the British Museum he transcribed and published most of the surviving
Anglo Saxon Charters as the
Cartularium Saxonicum in three volumes between 1885 and 1893, plus an index to named persons in 1899. In 1902 he left the British Museum to become personal librarian and curator to the
4th Marquess of Bute. == Death ==