Colorado College will be hosting the 40th Annual Workshop in Geometric Topology on June 15-17, 2023


The workshop programming begins at 9:00 a.m. on Thursday, June 15, and ends at noon on Saturday, June 17. Each day there will be a one-hour lecture by Principal Speaker Andy Putman as well as contributed talks by participants. The program is designed so there will be ample time for informal networking among participants. The workshop ends with a problem session at noon on Saturday. For those staying until Sunday, we will organize an informal hiking outing on Saturday afternoon (weather dependent).

Principal Speaker

Principal Speaker Andy Putman of the University of Notre Dame will give a series of three one-hour talks on the moduli space of curves. Title and abstract below.

The topology of the moduli space of curves

The moduli space of curves plays a fundamental role in many areas of math, ranging from low-dimensional topology and geometry to mathematical physics.  Because it lies at the juncture of so many areas of mathematics, it can be described from many points of view.

In my lectures I will give an introduction to different ways to think about it, and a broad survey of what we know and don’t know about its topology.

Contributed Talks

Participants are invited to contribute talks; time will be allotted each day for 20-minute talks by participants. Abstracts may be entered on the registration form or emailed directly to Molly Moran. Deadline to submit talk requests is May 15, 2023.

Financial Support

Financial support, provided by the National Science Foundation, will be available to cover partial travel and living expenses of participants who do not have other funding for their research. Such support can be requested on the registration form. To receive full consideration, requests for support should be submitted by April 25, 2023. Graduate students and recent PhDs in geometric topology are especially encouraged to apply.


  • Requests for Financial Support: April 25, 2023
  • On-Campus Housing Request, Hotel Discounted Rate, and Contributed Talk Deadline: May 15, 2023


  • Fredric Ancel, Univ of Wisconsin-Milwaukee
  • Greg Friedman, Texas Christian University
  • Craig Guilbault, Univ of Wisconsin-Milwaukee
  • Molly Moran, Colorado College
  • Eric Swenson, Brigham Young University
  • Frederick Tinsley, Colorado College
  • Nathan Sunukjian, Calvin College
  • Gerard Venema, Calvin College

Local Contact

Contact Molly Moran ( if you have questions about the workshop or comments on this web site.