September 18-22, "Geometry beyond Riemann: Curvature and Rigidity", Erwin Schroedinger Institute in Vienna, Austria
July 30-August 4, Applied and Computational Differential Geometry and Geometric PDEs, Banff International Research Station, Canada
July 17-19 2023, " Characters and Moduli of Surfaces , Kyoto Math Institute, Kyoto, Japan
July 31-August 6, ICCM, Beijing, China
June 20-24, "Spherical surfaces and related topics", cortona, Italy
June 7-10, "Reflections on Geometry: 3-Manifolds, Groups and Singularities -- A Conference in Honor of Walter Neumann", Columbia University
April 16, "Discrete conformal geometry of surfaces", Beijing Institute of Mathematical Sciences and Applications, Beijing, China
August 19-22, Computational and Applied Mathematics-ICCM, Nanjing, China. (deferred)
July 26-30, Computational & Algorithmic Topology, Sydney, Australia.
Apil 30, colloquium, New Mexico State University.
April 28, colloquium, Rutgers at Newark.
March 22, International Academic Symposium "Mathematical Science of Visualization, and Deepening of Symmetry and Moduli", Osaka, Japan
August, 10-14, Banff workshop, Banff, Canada (cancelled)
July 27-31, Computational & Algorithmic Topology, Sydney, Australia. (deferred)
July 6-10, circle packing and geometric rigidity, ICERM, Brown University, Providence.
June 14-19, Spherical surfaces and related topics , Cortona, Italy (deferred)
June 8-10, Characters and Moduli of Surfaces, Nara, Japan (cancelled)
March 4-9, International Academic Symposium "Mathematical Science of Visualization, and Deepening of Symmetry and Moduli", Osaka, Japan. (deferred)
Jan. 6-9, Frontier of Analysis and Geometry of Teichmuller Spaces, Sanya conference, China
Oct. 21-23, ATD workshop, George Washington University, DC.
Sept, 20-22, workshop on discrete shapes, UC Davis
April 24, Colluquium speaker, UC San Diego
Feb. 27, seminar talk at Brown University
Feb. 13, seminar talk at Harvard
Jan. 22, seminar talk at UC Santa Barbara
Jan. 14, seminar talk at USC
Oct. 8-12, 2018, Invited speaker, Discretization in Geometry and Dynamics, Döllnsee-Schorfheide, Templin, Germany. My talk discrete conformal geometry of polyhedral surfaces.
July 9-13, co-organizer, Geometry, Quantum Topology and Asymptotics 2018, conference at the Sandbjerg Estate, Denmark.
July 2-6, co-organizer, summer school on Geometry, Quantum Topology and Asymptotics 2018, Confucius Institute, University of Geneva, Switzerland.
April 20, PATCH Seminar, Philadelphia.
Oct. 9-13, Geometric analysis, organized by Centre Henri Lebesgue, University of Brest and University of Nantes, at Station Biologique de Roscoff, France. My talk discrete conformal geometry of polyhedral surfaces.
Oct. 7, Workshop on Topology: Identifying Order in Complex Systems. University of Pennsylvania, Pennsylvania.
Sept. 14-15, ATD workshop, American University, DC.
July 10-19, Computational Topology and Geometry, FoCM'17, Barcelona, Spain.
June 12-16, Geometry and Shape Analysis in Biological Sciences, National University of Singapore, Singapore.
May 16, seminar talk at Station Q, Microsoft, Santa Barbara, California.
May 11, topology seminar, UC Davis, Davis, California
March 13-17, Curvatures of graphs, simplicial complexes and metric spaces, Sanya International Mathematics Forum, Sanya, China.
Dec. 12-17, 2016, Quantum invariants and low-dimensional topology, The international Mathematical Research Institute MATRIX, Victoria, Australia
Sept 24-25, Eastern AMS Sectional meeting, Bowdoin College in Brunswick, Maine.
August 15-19, 2016, "Program on Geometry, Topology and Dynamics of Moduli Spaces", National University of Singapore, Singapore.
August 13-14, 2016, “Workshop on Discrete Analysis”, Shanghai Center of Mathematical Sciences, Fudan University, Shanghai, China.
July 24-30, 2016, "On the Grothendieck-Teichmüller theory and mapping class groups", Chern Institute of Mathematics, Tianjin, China
June 27-July 1, 2016, Geometric Analysis, Metric Geometry and Topology at Institut Fourier, Grenoble, France.
June 20-June 24, 2016, give a lecture series titled "An introduction to discrete conformal geometry of polyhedral surfaces" in the summer school Geometric analysis, Metric geometry and Topology, Institut Fourier, Grenoble, France. Videos: Lecture 1 , Lecture 2 , Lecture 3 , Lecture 4 , Lecture 5
May 3-19, 2016, University of Sydney, Australia
March 19-20, AMS regional meeting at Stony Brook
Jan. 11-16, “Teichmüller theory and low-dimensional topology” , Sanya International Mathematics Forum, Sanya, China
Oct. 5-9, 2015, "Geometric Structures on 3-Manifolds", IAS, Princeton, NJ. My talk Rigidity of the hexagonal triangulation of the plane and its applications.
August 10-14, 2015, organizer, Invariants in low dimensional geometry, Gazi University, Ankara, Turkey.
August 2-8, 2015, visiting and giving a talk at CENTRE FOR QUANTUM GEOMETRY OF MODULI SPACES, Aarhus, Denmark.
July 6-10, 2015, Scientific committee, Classical and quantum hyperbolic geometry and topology, Université Paris-Sud (Orsay), France.
April 21-22, 2015, Identities in New York , CUNY graduate center. New York.
April 16, 2015, topology seminar, Princeton Univ.
April 14, 2015, colloquium speaker, Purdue University
March 26, 2015, topology seminar, Stony Brook
March 1-7, 2015, Oberwolfach workshop on discrete differential geometry, Germany
Jan. 15, 2015, topology seminar, Caltech
Jan. 13, 2015, Microft Station Q seminar, Santa Barbara
Dec. 15-19, Sanya International Mathematics Forum, Sanya, China
August 22-26, Knots and Low Dimensional Manifolds , Busan, Korea.
August 4-8, geometry and physics of Higgs bundles, National University of Singapore, Singapore
July 27-Aug. 1, Mathematical Foundation of Modern Data Sciences, Dalian, China
June 30-July 5, co-organizer, Geometry, Quantum Topology and Asymptotics, University of Geneva, Switzerland
Mar 15-22, University of Sydney and University of Melbourn, Australia
Mar 10-12, ATD workshop, Boulder, Colorado.
Feb. 9-15, Oberwolfach workshop on Teichmuller theory and mapping class groups, Germany
Nov. 5-8, "Geometry of Moduli Spaces of Low Dimensional Manifolds", RIMS, Kyoto University, Japan
Oct. 23, colloquium talk, Lehigh University
Oct. 12, special session of AMS meeting, Philadelphia
Sept. 11-15, BMS/SFB Summer School: Discrete Differential Geometry, Berlin, Germany
August 12-16, Geometric Topology in New York, Columbia University
July 14-19, ICCM 2013, Taiwan
May 8-June 14, visiting and giving a lecture series at Mathematical Sciences Center (MSC) , Tsinghua University, Beijing China
April 26-28, Workshop on Minimal Surfaces, 3-Manifold Topology and Related Topics, MIT
April 18, colloquium talk, SUNY, Stony Brook
April 7-12, Banff workshop, Canada
March 16-24, University of Pisa, Italy
August 3-6, invited speaker, "International conference on complex geometry, singularities and related fields", Beijing, China.
July 21-29, invited speaker, "International conference on group actions and applications in geometry, topology and analysis", Kunming, China.
July 19-21, invited speaker, The 3-D Geometry/Imaging Conference, Kunming, China.
July 8-14, invited speaker, Oberwolfach workshop on Discrete Differential Geometry, Germany
June 25-29, invited speaker, Mapping Class Groups and Quantum Topology, IRMA, University of Strassboug, France
April 29-May 5, invited speaker, Oberwolfach workshop on Triangulations, Germany
March 26-April 25, invited lecturer, Mathematical Science Center, Tsinghua University, Beijing, China
April 13, colloquium talk, School of Math, Peking University, Beijing China
March 22, Topology seminar, SUNY Stony Brook
March 13-14, invited speaker, geometry and topology workshop, Princeton University.
May 25-26, invited speaker, "Knots and Applications", Centro di Ricerca Matematica Ennio De Giorgi, Pisa, Italy. My talk "a dilogarithm identity on moduli spaces of curves".
June 14-July 16, a series of 20-hour-lectures on Riemann surfaces and Teichmuller theory, Mathematical Science Center, Tsinghua University, Beijing, China,
July 8, seminar speaker at the dept of Math, The Capital Normal University, Beijing, China.
July 14, seminar speaker at the Mathematics Institute of the Chinese Acadmey of Science, Beijing, China.
July 18-22, invited speaker, "Geometry & Topology Down Under" (Hyamfest), The University of Melbourne, Australia, My talk "variational principles and rigidity on triangulated surfaces".
Oct. 6, Topology seminar at Princeton University
Oct. 21, Topolog seminar at Columbia University
Nov. 15, Topology seminar at Temple University
Dec. 13, Geometry seminar at UC San Diego
Jan. 8, topology seminar, Caltech, Los Angeles
Jan. 12, topology seminar, UC Santa Barbara
April 15, Topology seminar, City University of New York, Graudate Center
May 17-21, invited speaker, Barrett Memorial Lectures, University of Tennessee, Knoxville my lecture.
June 4-6, speaker and co-organizer, "Topology and geometry in dimension three"- celebrating Jaco's 70-th birthday, University of Oklahoma, Stillwater
July 7-16, invited speaker, workshop on geometric topology, Changchun, China.
July 16, invited lecture at the Center of Mathematical Science, Qinghua University, Beijing
July 19, invited lecture at the Beijing International Center for Mathematical Research, Beijing
July 20, invited lecture at the capital Normal University, Beijing
July 19-30, invited speaker, Topology, Geometry and Dynamics of character varieties, National University of Singapore
August 11-12, invited speaker, Sullivan Seminar, State University of New York, NY
Sept. 2-4, invited speaker, Encounters between mathematicians and theoretical physicists, University of Strassboug, France
Dec. 17-20, invited speaker, International Congress of Chinese Mathematicians, Qinghua University, China.
Jan. 5-6, invited speaker, AMS meeting at Washington DC.
Jan. 10-17, invited speaker, Oberwolfach workshop on discrete differential geometry
Feb. 11-15, colloquium talk at Arizona State
April 14, seminar talk at University of Maryland
June 15-19, invited speaker, "Interactions Between Hyperbolic Geometry, Quantum Topology and Number Theory ", Columbia University, New York
July 7-14, invited speaker, "Workshop on low-dimensional manifolds", East China Normal University, Shanghai, China
March 13, 2008, invited speaker, topology seminar, Princeton University
April 25, 2008, colloquium speaker, Okalahoma State University.
May 13, 2008, invited speaker, bay area topology seminar, Univ. of California, Davis.
June 4, 2008, invited speaker, Mini-Symposia, IEEE International Conference on Shape Modeling and Applications , State University of New York, Stony Brook.
June 16-28, 2008, invited speaker, International workshop and conference on surface mapping class groups and related topics. Meghalaya, India.
June 30-July 11, 2008, Invited speaker, Transformation groups and orbifolds. Hangzhou, China
July 14-20, 2008, Invited speaker, Geometry of Teichmuller spaces and moduli spaces of curves. Hangzhou, China.
Sept. 11-13, 2008, invited speaker, Ricci flow in mathematics and physics , University of Strasbourg, France. my talk
Jan. 8, 2007, AMS special session invited speaker. My talk " the cosine law and volume" . New Orleans, LA.
March. 15, 2007, colloquium speaker, Boston College, "rigidity of polyhedral surfaces" .
April 12-14, 2007, invited speaker, ASPECTS OF TEICHMUELLER THEORY, University of Michigan.
April 28-29, 2007, invited speaker, "Pacific Northwest Geometry Seminar" Univ. of Utah.
May 20-26, 2007, invited speaker, "BRAIDS AND THEIR RAMIFICATIONS" Cortona, Italy.
May 30-June 3, 2007, invited speaker, "A second time around the volume conjecture" Louisiana State University. .
June 18-22, 2007, speaker and co-organizer, "Geometric topology" Beijing, China .
June 25-30, 2007, speaker and co-organizer, Geometric topology and geometric analysis , CMS, Zhejiang University, Hangzhou, China.
July 16-20, 2007, invited speaker, "Discrete Differential Geometry" Berlin, Germany.
July 27-31, 2007, speaker and co-organizer, International Conference on Topology and Physics - In Memory of Xiao-Song Lin, Tianjin, China.
Oct. 20-21, invited speaker, "workshop on geometric evolution equations", UC San Diego.
Dec. 17-22, 2007, invited plenary speaker, "The fourth International Congress of Chinese Mathematicians", Hangzhou, China.
March 6-10, 2006, invited speaker, Oberwolfach workshop Discrete differential geometry. My talk "some applications of the cosine law" .
March 16-19, 2006, invited speaker (two lectures), Geometric Group Theory on the Gulf Coast.
May 17-21, 2006, invited speaker, Georgia Topology Conference .
Oct. 27-29, 2006, invited speaker, Texas Geometry and Topology Conference . My talk "volume and angle structures on 3-manifolds".