author
John Casey
1820–1891
A self-taught Irish mathematician and schoolmaster, he became one of the leading geometers of his time. His clear, influential books on Euclid and modern geometry helped carry advanced mathematics to a wider audience.
1 Audiobook
The First Six Books of the Elements of Euclid
by Euclid, John Casey
About the author
Born in County Limerick in 1820, John Casey rose from modest beginnings to become a respected Irish mathematician, teacher, and textbook writer. He worked for many years in education before earning wider recognition for his mathematical research, especially in geometry.
Casey is best remembered for work that includes Casey’s theorem, but he was also known for making difficult ideas easier to follow. His books on Euclid and later geometry were widely used and valued for their clarity, which makes him a natural fit for readers interested in classic mathematical writing.
He later studied at Trinity College Dublin and received major academic honors, including election to the Royal Irish Academy. He died in Dublin in 1891, leaving behind both original mathematical work and teaching books that kept his name in circulation long after his lifetime.