Bolyai and Lobatschevsky
euclids elements
'Elements' was written by Euclid.
compositions
euclids elements
There are 13 books in Euclid's Elements.
Regular solids
pythogoras
euler
Archimedes
john graunt
Probably all mathematicians, from very ancient times.
Yes. There were mathematicians who were in geometry. In fact, anyone who contributed to our understanding of geometry was a mathematician.