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Lenhard L. Ng, Eads Family Professor

Lenhard L. Ng

My research mainly focuses on symplectic topology and low-dimensional topology. I am interested in studying structures in symplectic and contact geometry (Weinstein manifolds, contact manifolds, Legendrian and transverse knots), especially through holomorphic-curve techniques. One particular interest is extracting topological information about knots through cotangent bundles, and exploring relations to topological string theory. I have also worked in Heegaard Floer theory, quantum topology, and sheaf theory, especially as they relate to Legendrian and transverse knots.

Contact Info:
Office Location:  120 Science Drive, Durham, NC 27708
Email Address: send me a message
Web Page:  https://services.math.duke.edu/~ng/

Teaching (Fall 2025):

  • MATH 611.01, ALGEBRAIC TOPOLOGY I Synopsis
    Physics 205, TuTh 03:05 PM-04:20 PM
Office Hours:

Spring 2025:


  • Mondays 1:00-2:00

  • Wednesdays 2:45-3:45 (may end early)


and by appointment.
Education:

Ph.D.Massachusetts Institute of Technology2001
ABHarvard University1996
Specialties:

Geometry
Topology
Research Interests: Symplectic geometry, Low dimensional topology, Contact geometry, Knot theory, Holomorphic curves

Keywords:

Contact geometry • Holomorphic curves • Knot theory • Low dimensional topology • Symplectic and contact topology • Symplectic geometry • Three-manifolds (Topology) • Topology

Curriculum Vitae
Current Ph.D. Students   (Former Students)

  • Yu Pan  
  • Caitlin Leverson  
Postdocs Mentored

  • Christopher Cornwell (2011 - 2014)  
  • Daniel Rutherford (2008 - 2011)  
Undergraduate Research Supervised

  • Alexandru Milu (2014 - 2015)  
  • Alexandru Milu (May 12, 2014 - June 27, 2014)  
  • Wutichai Chongchitmate (2009 - 2010)  
  • Tirasan Khandhawit (2007 - 2008)  
Recent Publications   (More Publications)

  1. Feehan, PMN; Ng, LL; Ozsváth, PS, Frontiers in Geometry and Topology (July, 2024), pp. 320 pages, American Mathematical Society, ISBN 9781470470876  [abs]
  2. Lipshitz, R; Ng, L, Torsion in linearized contact homology for Legendrian knots (August, 2023)  [abs]
  3. Casals, R; Ng, L, Braid loops with infinite monodromy on the Legendrian contact DGA, Journal of Topology, vol. 15 no. 4 (December, 2022), pp. 1927-2016, WILEY [doi]  [abs]
  4. Ng, L; Rutherford, D; Shende, V; Sivek, S; Zaslow, E, Augmentations are sheaves, Geometry and Topology, vol. 24 no. 5 (January, 2020), pp. 2149-2286, Mathematical Sciences Publishers [doi]  [abs]
  5. Ekholm, T; Ng, L, Higher genus knot contact homology and recursion for colored HOMFLY-PT polynomials, Advances in Theoretical and Mathematical Physics, vol. 24 no. 8 (January, 2020), pp. 2067-2145 [doi]  [abs]
Recent Grant Support

  • Enhanced invariants of Legendrian links, National Science Foundation, 2025/07-2028/06.      
  • Holomorphic Invariants of Knots and Contact Manifolds, National Science Foundation, 2020/09-2024/08.      
Conferences Organized

  • Organizer : 27th Annual Geometry Festival. April 27, 2012 - April 29, 2012, Organizer : 27th Annual Geometry Festival, April 27, 2012 - April 29, 2012  
  • Organizer, workshop "Cyclic homology and symplectic topology". November, 2009, Organizer, workshop "Cyclic homology and symplectic topology", November, 2009  
  • Organizer, workshop "Algebraic structures in the theory of holomorphic curves". November, 2009, Organizer, workshop "Algebraic structures in the theory of holomorphic curves", November, 2009  

 

dept@math.duke.edu
ph: 919.660.2800
fax: 919.660.2821

Mathematics Department
Duke University, Box 90320
Durham, NC 27708-0320