A geometer is a mathematician whose area of study is geometry. Some important geometers and their main fields of work are:

Mathematicians

• Apastamba - euclidean geometry, geometric algebra
• Apollonius of Perga - euclidean geometry, conic sections
• Archimedes - euclidean geometry
• Albert Victor Bäcklund
• Henry Frederick Baker - algebraic geometry
• Baudhayana - euclidean geometry, geometric algebra
• Luigi Bianchi - differential geometry
• Janos Bolyai - non-euclidean geometry
• Pierre Ossian Bonnet - differential geometry
• Brahmagupta - euclidean geometry, cyclic quadrilaterals
• Lazare Nicolas Marguerite Carnot - projective geometry
• Arthur Cayley
• Giovanni Ceva - euclidean geometry
• Shiing-Shen Chern - differential geometry
• Delfino Codazzi - differential geometry
• J. H. Conway - sphere packing, recreational geometry
• H. S. M. Coxeter - theory of polytopes, non-euclidean geometry, projective geometry
• Germinal Dandelin - Dandelin spheres in conic sections
• Julius Wilhelm Richard Dedekind
• René Descartes - invented the methodology analytic geometry
• Joseph Diaz Gergonne - projective geometry; Gergonne point
• Girard Desargues - projective geometry; Desargues' theorem
• Eratosthenes - euclidean geometry
• La Hire - projective geometry
• Euclid - Elements, euclidean geometry
• Leonhard Euler - everything
• Karl Wilhelm Feuerbach - euclidean geometry
• Carl Friedrich Gauss - Theorema Egregium.
• Hero of Alexandria - euclidean geometry
• Robin Hartshorne - All kinds of geometry
• William Vallance Douglas Hodge
• Hypatia of Alexandria - euclidean geometry
• Jyesthadeva - euclidean geometry, cyclic quadrilaterals
• Katyayana - euclidean geometry
• Felix Klein
• Sofia Vasilyevna Kovalevskaya
• Nikolai Ivanovich Lobachevsky - non-euclidean geometry
• Manava - euclidean geometry
• Hermann Minkowski - non-euclidean geometry
• August Ferdinand Möbius - euclidean geometry
• Gaspard Monge - descriptive geometry
• Max Noether - algebraic geometry
• Omar Khayyam - algebraic geometry, conic sections
• Blaise Pascal - projective geometry
• Daniel Pedoe
• John Playfair - euclidean geometry
• Julius Plucker
• Henri Poincaré
• Jean-Victor Poncelet - projective geometry
• Pappus of Alexandria - euclidean geometry, projective geometry
• Siméon-Denis Poisson
• Pythagoras - euclidean geometry
• Bernhard Riemann - non-euclidean geometry
• Giovanni Gerolamo Saccheri - non-euclidean geometry
• Nilakantha Somayaji - geometric progressions
• Jakob Steiner - a champion of synthetic geometry methodology, projective geometry, euclidean geometry
• Thabit ibn Qurra - analytic geometry, non-euclidean geometry, conic sections
• Thales of Miletus - euclidean geometry
• Abu'l-Wáfa - spherical geometry, non-euclidean geometry
• Zeno of Elea - euclidean geometry

Others

• Albert Einstein - non-euclidean geometry
• Maurits Cornelis Escher (trained as architect; worked as artist; was not a mathematician but used geometrical ideas extensively)
• Buckminster Fuller
• Leonardo da Vinci - euclidean geometry
• Isaac Newton - 3rd degree algebraic curves

Lists of people by occupation | Mathematics-related lists | Geometers