Joel Hass

Professor, Department of Mathematics

Research - Teaching - Editorial and Administrative - Books - Personal

Tel: (530) 754-0236
Fax: (530) 752-6635
email: hass(at symbol)

The next Workshop on Discrete Shapes organized by the FRG on Discrete Shapes will be held on May 6-8, 2022 (Friday-Sunday) at CMSA, Harvard.
More information will be posted here soon, and at

In Fall Quarter 2021 I am teaching Calculus 21C.
In Winter Quarter 2021 I organized the
Geometry and Topology Seminar
along with Josh Howie and Abigail Thompson.

The schedule for upcoming talks can be found here: Coming talks

Some of the talks were recorded and can be accessed below.

Marc Lackenby's February 2, 2021 talk on a quasi-polynomial unknotting algorithm can be found here.
Marc Lackenby on unknotting in quasipolynomial time.

Michael Freedman talked on March 2, 2021 on "Controlled Mather Thurston Theorems."
Mike Freedman on Controlled Mather Thurston Theorems .

Lisa Piccirillo talked on March 9, 2021 on "Knot concordance and exotica."
Lisa Piccirillo on Knot concordance and exotica .