Lenny Ng Professor Department of Mathematics Duke University Office: Physics 216 Phone: 919-660-6972 Email: my surname at math dot duke dot edu (further contact information here) Refresh for another random image; click image for gallery.

Papers and preprints Teaching (Spring 2025: Math 612) Travel schedule Contact information Curriculum vitae Legendrian knot and link atlases Legendrian knot gallery Putnam solutions About me I am an organizer for the CBMS Summer School on Legendrian Links and the Microlocal Theory of Sheaves, being held at Georgia Tech June 9-13, 2025. Please apply if you're interested in attending; the application deadline is March 28. (January 2025) Duke undergraduate research opportunities in math for summer 2025: applications for Math+ and PRUV are now open. The deadline for Math+ applications is February 15. (January 2025) Solutions to the 2024 Putnam competition are now available. (December 2024) I was an organizer for Frontiers in Geometry and Topology, the 2022 graduate summer school and research conference in honor of Tom Mrowka. Here are the relevant web pages for the graduate summer school and the research conference. (May 2022) I help to organize the Triangle Topology Seminar, a joint seminar between Duke, NCSU, and UNC. Here is a link to upcoming seminars. I am an editor for the journal Quantum Topology. Please send me a message if you are interested in submitting an article, especially in symplectic and contact topology.