A geometer or geometrician is a mathematician who specializes in geometry.

Some notable geometers and their main fields of work, chronologically listed, are:

1000 BC to 1 BC

• Baudhayana (fl. c. 800 BC) – Euclidean geometry

• Manava (c. 750 BC–690 BC) – Euclidean geometry

• Thales of Miletus (c. 624 BC – c. 546 BC) – Euclidean geometry

• Pythagoras (c. 570 BC – c. 495 BC) – Euclidean geometry, Pythagorean theorem

• Zeno of Elea (c. 490 BC – c. 430 BC) – Euclidean geometry

• Hippocrates of Chios (born c. 470 – 410 BC) – first systematically organized Stoicheia – Elements (geometry textbook)

• Mozi (c. 468 BC – c. 391 BC)

• Plato (427–347 BC)

• Theaetetus (c. 417 BC – 369 BC)

• Autolycus of Pitane (360–c. 290 BC) – astronomy, spherical geometry

• Euclid (fl. 300 BC) – Elements, Euclidean geometry (sometimes called the "father of geometry")

• Apollonius of Perga (c. 262 BC – c. 190 BC) – Euclidean geometry, conic sections

• Archimedes (c. 287 BC – c. 212 BC) – Euclidean geometry

• Eratosthenes (c. 276 BC – c. 195/194 BC) – Euclidean geometry

• Katyayana (c. 3rd century BC) – Euclidean geometry

1–1300 AD

• Hero of Alexandria (c. AD 10–70) – Euclidean geometry

• Pappus of Alexandria (c. AD 290–c. 350) – Euclidean geometry, projective geometry

• Hypatia of Alexandria (c. AD 370–c. 415) – Euclidean geometry

• Brahmagupta (597–668) – Euclidean geometry, cyclic quadrilaterals

• Vergilius of Salzburg (c.700–784) – Irish bishop of Aghaboe, Ossory and later Salzburg, Austria; antipodes, and astronomy

• Al-Abbās ibn Said al-Jawharī (c. 800–c. 860)

• Thabit ibn Qurra (826–901) – analytic geometry, non-Euclidean geometry, conic sections

• Abu'l-Wáfa (940–998) – spherical geometry, spherical triangles

• Ibn al-Haytham (965–c. 1040)

• Omar Khayyam (1048–1131) – algebraic geometry, conic sections

• Ibn Maḍāʾ (1116–1196)

1301–1800 AD

• Piero della Francesca (1415–1492)

• Leonardo da Vinci (1452–1519) – Euclidean geometry

• Jyesthadeva (c. 1500 – c. 1610) – Euclidean geometry, cyclic quadrilaterals

• Marin Getaldić (1568–1626)

• Jacques-François Le Poivre (1652–1710) – projective geometry

• Johannes Kepler (1571–1630) – (used geometric ideas in astronomical work)

• Edmund Gunter (1581–1686)

• Girard Desargues (1591–1661) – projective geometry; Desargues' theorem

• René Descartes (1596–1650) – invented the methodology of analytic geometry, also called Cartesian geometry after him

• Pierre de Fermat (1607–1665) – analytic geometry

• Blaise Pascal (1623–1662) – projective geometry

• Christiaan Huygens (1629–1695) – evolute

• Giordano Vitale (1633–1711)

• Philippe de La Hire (1640–1718) – projective geometry

• Isaac Newton (1642–1727) – 3rd-degree algebraic curve

• Giovanni Ceva (1647–1734) – Euclidean geometry

• Johann Jacob Heber (1666–1727) – surveyor and geometer

• Giovanni Gerolamo Saccheri (1667–1733) – non-Euclidean geometry

• Leonhard Euler (1707–1783)

• Tobias Mayer (1723–1762)

• Johann Heinrich Lambert (1728–1777) – non-Euclidean geometry

• Gaspard Monge (1746–1818) – descriptive geometry

• John Playfair (1748–1819) – Euclidean geometry

• Lazare Nicolas Marguerite Carnot (1753–1823) – projective geometry

• Joseph Diaz Gergonne (1771–1859) – projective geometry; Gergonne point

• Carl Friedrich Gauss (1777–1855) – Theorema Egregium

• Louis Poinsot (1777–1859)

• Siméon Denis Poisson (1781–1840)

• Jean-Victor Poncelet (1788–1867) – projective geometry

• Augustin-Louis Cauchy (1789–1857)

• August Ferdinand Möbius (1790–1868) – Euclidean geometry

• Nikolai Ivanovich Lobachevsky (1792–1856) – hyperbolic geometry, a non-Euclidean geometry

• Michel Chasles (1793–1880) – projective geometry

• Germinal Dandelin (1794–1847) – Dandelin spheres in conic sections

• Jakob Steiner (1796–1863) – champion of synthetic geometry methodology, projective geometry, Euclidean geometry

1801–1900 AD

• Karl Wilhelm Feuerbach (1800–1834) – Euclidean geometry

• Julius Plücker (1801–1868)

• János Bolyai (1802–1860) – hyperbolic geometry, a non-Euclidean geometry

• Christian Heinrich von Nagel (1803–1882) – Euclidean geometry

• Johann Benedict Listing (1808–1882) – topology

• Hermann Günther Grassmann (1809–1877) – exterior algebra

• Ludwig Otto Hesse (1811–1874) – algebraic invariants and geometry

• Ludwig Schlafli (1814–1895) – Regular 4-polytope

• Pierre Ossian Bonnet (1819–1892) – differential geometry

• Arthur Cayley (1821–1895)

• Joseph Bertrand (1822–1900)

• Delfino Codazzi (1824–1873) – differential geometry

• Bernhard Riemann (1826–1866) – elliptic geometry (a non-Euclidean geometry) and Riemannian geometry

• Julius Wilhelm Richard Dedekind (1831–1916)

• Ludwig Burmester (1840–1927) – theory of linkages

• Edmund Hess (1843–1903)

• Albert Victor Bäcklund (1845–1922)

• Max Noether (1844–1921) – algebraic geometry

• Henri Brocard (1845–1922) – Brocard points

• William Kingdon Clifford (1845–1879) – geometric algebra

• Pieter Hendrik Schoute (1846–1923)

• Felix Klein (1849–1925)

• Sofia Vasilyevna Kovalevskaya (1850–1891)

• Evgraf Fedorov (1853–1919)

• Henri Poincaré (1854–1912)

• Luigi Bianchi (1856–1928) – differential geometry

• Alicia Boole Stott (1860–1940)

• Hermann Minkowski (1864–1909) – non-Euclidean geometry

• Henry Frederick Baker (1866–1956) – algebraic geometry

• Élie Cartan (1869–1951)

• Dmitri Egorov (1869–1931) – differential geometry

• Veniamin Kagan (1869–1953)

• Raoul Bricard (1870–1944) – descriptive geometry

• Ernst Steinitz (1871–1928) – Steinitz's theorem

• Marcel Grossmann (1878–1936)

• Oswald Veblen (1880–1960) – projective geometry, differential geometry

• Nathan Altshiller Court (1881–1968) – author of College Geometry

• Emmy Noether (1882–1935) – algebraic topology

• Harry Clinton Gossard (1884–1954)

• Arthur Rosenthal (1887–1959)

• Helmut Hasse (1898–1979) – algebraic geometry

1901–present

• William Vallance Douglas Hodge (1903–1975)

• Patrick du Val (1903–1987)

• Beniamino Segre (1903–1977) – combinatorial geometry

• J. C. P. Miller (1906–1981)

• André Weil (1906–1998) – Algebraic geometry

• H. S. M. Coxeter (1907–2003) – theory of polytopes, non-Euclidean geometry, projective geometry

• J. A. Todd (1908–1994)

• Daniel Pedoe (1910–1998)

• Shiing-Shen Chern (1911–2004) – differential geometry

• Ernst Witt (1911–1991)

• Rafael Artzy (1912–2006)

• Aleksandr Danilovich Aleksandrov (1912–1999)

• László Fejes Tóth (1915–2005)

• Edwin Evariste Moise (1918–1998)

• Aleksei Pogorelov (1919–2002) – differential geometry

• Magnus Wenninger (1919–2017) – polyhedron models

• Jean-Louis Koszul (1921–2018)

• Isaak Yaglom (1921–1988)

• Eugenio Calabi (1923–2023)

• Benoit Mandelbrot (1924–2010) – fractal geometry

• Katsumi Nomizu (1924–2008) – affine differential geometry

• Michael S. Longuet-Higgins (1925–2016)

• John Leech (1926–1992)

• Alexander Grothendieck (1928–2014) – algebraic geometry

• Branko Grünbaum (1929–2018) – discrete geometry

• Michael Atiyah (1929–2019)

• Lev Semenovich Pontryagin (1908–1988)

• Geoffrey Colin Shephard (1927–2016)

• Norman W. Johnson (1930–2017)

• John Milnor (1931–)

• Roger Penrose (1931–)

• Yuri Manin (1937–2023) – algebraic geometry and diophantine geometry

• Vladimir Arnold (1937–2010) – algebraic geometry

• Ernest Vinberg (1937–2020)

• J. H. Conway (1937–2020) – sphere packing, recreational geometry

• Robin Hartshorne (1938–) – geometry, algebraic geometry

• Phillip Griffiths (1938–) – algebraic geometry, differential geometry

• Enrico Bombieri (1940–) – algebraic geometry

• Robert Williams (1942–)

• Peter McMullen (1942–)

• Richard S. Hamilton (1943–2024) – differential geometry, Ricci flow, Poincaré conjecture

• Mikhail Gromov (1943–)

• Rudy Rucker (1946–)

• William Thurston (1946–2012)

• Shing-Tung Yau (1949–)

• Michael Freedman (1951–)

• Egon Schulte (1955–) – polytopes

• George W. Hart (1955–) – sculptor

• Károly Bezdek (1955–) – discrete geometry, sphere packing, Euclidean geometry, non-Euclidean geometry

• Simon Donaldson (1957–)

• Kenji Fukaya (1959–) – symplectic geometry

• Yong-Geun Oh (1961–)

• Toshiyuki Kobayashi (1962–)

• Hiraku Nakajima (1962–) – representation theory and geometry

• Hwang Jun-Muk (1963–) – algebraic geometry, differential geometry

• Grigori Perelman (1966–) – Poincaré conjecture

• Maryam Mirzakhani (1977–2017)

• Denis Auroux (1977–)

Geometers in art

See also

• Mathematics and architecture

References