Yongbin Ruan (; born 14 February 1963) is a Chinese mathematician, specializing in algebraic geometry, differential geometry, and

symplectic geometry Symplectic geometry is a branch of differential geometry and differential topology that studies symplectic manifolds; that is, differentiable manifolds equipped with a closed, nondegenerate 2-form. Symplectic geometry has its origins in the ...

with applications to string theory. Ruan studied from 1978 at

Sichuan University Sichuan University (SCU) is a national key public research university in Chengdu, Sichuan, China. The university is wholly funded by the Ministry of Education. SCU is one of the top universities of China, and a Class A Double First Class Univer ...

with ''Benke'' Certificate of graduation followed by a master's degree in 1985. In 1985/86 he was a teaching assistant at the

University of Wisconsin–Madison A university () is an institution of higher (or tertiary) education and research which awards academic degrees in several academic disciplines. ''University'' is derived from the Latin phrase ''universitas magistrorum et scholarium'', which ...

. In 1991 he received his Ph.D. from the

University of California, Berkeley The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public land-grant research university in Berkeley, California. Established in 1868 as the University of California, it is the state's first land-grant u ...

with thesis ''Gauge theory and its applications to Riemannian Geometry'' under the supervision of

Robion Kirby Robion Cromwell Kirby (born February 25, 1938) is a Professor of Mathematics at the University of California, Berkeley who specializes in low-dimensional topology. Together with Laurent C. Siebenmann he invented the Kirby–Siebenmann invariant ...

(and

Tomasz Mrowka Tomasz Mrowka (born September 8, 1961) is an American mathematician specializing in differential geometry and gauge theory. He is the Singer Professor of Mathematics and former head of the Department of Mathematics at the Massachusetts Institut ...

). As a postdoctoral researcher he was at

Michigan State University Michigan State University (Michigan State, MSU) is a public university, public Land-grant university, land-grant research university in East Lansing, Michigan. It was founded in 1855 as the Agricultural College of the State of Michigan, the fi ...

. In 1993 he became an assistant professor at the

University of Utah The University of Utah (U of U, UofU, or simply The U) is a public research university in Salt Lake City, Utah. It is the flagship institution of the Utah System of Higher Education. The university was established in 1850 as the University of D ...

. At the University of Wisconsin–Madison he became in 1995 an associate professor and in 1999 a full professor. Since 2006 he is a professor at the

University of Michigan , mottoeng = "Arts, Knowledge, Truth" , former_names = Catholepistemiad, or University of Michigania (1817–1821) , budget = $10.3 billion (2021) , endowment = $17 billion (2021)As o ...

. He has been a visiting professor at the

ETH Zurich (colloquially) , former_name = eidgenössische polytechnische Schule , image = ETHZ.JPG , image_size = , established = , type = Public , budget = CHF 1.896 billion (2021) , rector = Günther Dissertori , president = Joël Mesot , a ...

, in Hong Kong, and at MIT. He was in 1993 and again in 2004 at the

Institut des hautes études scientifiques An institute is an organisational body created for a certain purpose. They are often research organisations (research institutes) created to do research on specific topics, or can also be a professional body. In some countries, institutes can ...

, in 1993 at the

Max Planck Institute for Mathematics The Max Planck Institute for Mathematics (german: Max-Planck-Institut für Mathematik, MPIM) is a prestigious research institute located in Bonn, Germany. It is named in honor of the German physicist Max Planck and forms part of the Max Plan ...

, in 1994 at Cambridge's

Isaac Newton Institute The Isaac Newton Institute for Mathematical Sciences is an international research institute for mathematics and its many applications at the University of Cambridge. It is named after one of the university's most illustrious figures, the mathema ...

, and in 1994 at the

Mathematical Sciences Research Institute The Simons Laufer Mathematical Sciences Institute (SLMath), formerly the Mathematical Sciences Research Institute (MSRI), is an independent nonprofit mathematical research institution on the University of California campus in Berkeley, Califo ...

. In 1998 he was an Invited Speaker with talk ''Quantum Cohomology and its Applications'' at the

International Congress of Mathematicians The International Congress of Mathematicians (ICM) is the largest conference for the topic of mathematics. It meets once every four years, hosted by the International Mathematical Union (IMU). The Fields Medals, the Nevanlinna Prize (to be rename ...

Berlin Berlin is Capital of Germany, the capital and largest city of Germany, both by area and List of cities in Germany by population, by population. Its more than 3.85 million inhabitants make it the European Union's List of cities in the European U ...

. From 1995 to 1997 he was a

Sloan Research Fellow The Sloan Research Fellowships are awarded annually by the Alfred P. Sloan Foundation since 1955 to "provide support and recognition to early-career scientists and scholars". This program is one of the oldest of its kind in the United States. ...

. He became a Fellow of the

American Mathematical Society The American Mathematical Society (AMS) is an association of professional mathematicians dedicated to the interests of mathematical research and scholarship, and serves the national and international community through its publications, meetings ...

in the class of 2015.

Selected publications

* * * * with W. Chen: ''Orbifold Gromov-Witten theory.'' Orbifolds in mathematics and physics (Madison, WI, 2001), 25–85, Contemp. Math., 310, Amer. Math. Soc., Providence, RI, 2002 * with A. Li: ''Symplectic surgery and Gromov-Witten invariants of Calabi-Yau 3-folds.'' Invent. Math. 145 (2001), no. 1, 151–218. * with

Gang Tian Tian Gang (; born November 24, 1958) is a Chinese mathematician. He is a professor of mathematics at Peking University and Higgins Professor Emeritus at Princeton University. He is known for contributions to the mathematical fields of Kähler ...

: ''Higher genus symplectic invariants and sigma models coupled with gravity'',

Inventiones Mathematicae ''Inventiones Mathematicae'' is a mathematical journal published monthly by Springer Science+Business Media. It was established in 1966 and is regarded as one of the most prestigious mathematics journals in the world. The current managing editors ...

, vol. 130, 1997, pp. 455–516
arXiv preprint
* ''Topological sigma model and Donaldson type invariants in Gromov theory'', Duke Mathematical Journal, vol. 83, 1996, pp. 63–98 * with Gang Tian: ''A mathematical theory of quantum cohomology'',

Journal of Differential Geometry The ''Journal of Differential Geometry'' is a peer-reviewed scientific journal of mathematics published by International Press on behalf of Lehigh University in 3 volumes of 3 issues each per year. The journal publishes an annual supplement in boo ...

, vol. 42, 1995, pp. 259–367 * ''Stringy geometry and topology of orbifolds'', Contemporary Mathematics, vol. 312
arXiv preprint

References

{{DEFAULTSORT:Ruan, Yongbin 1963 births Living people 20th-century Chinese mathematicians 21st-century Chinese mathematicians Chinese expatriates in the United States Fellows of the American Mathematical Society Sichuan University alumni Sloan Research Fellows University of California, Berkeley alumni University of Michigan faculty University of Utah faculty University of Wisconsin–Madison faculty