I am a postdoc at the University Bielefeld, Germany, in the BIREP group.

In 2020 I finished my PhD at the University of Utah. There I studied commutative algebra with Srikanth Iyengar. The title of my thesis is Generation Time in Derived Categories.

I obtained a Bachelor in Mathematics in 2014 and a Bachelor in Physics in 2015 from the Johannes Gutenberg University Mainz, Germany.

I am interested in triangulated, derived, and stable categories.

Here is my CV.


  1. Locally Complete Intersection Maps and the Proxy Small Property with Ben Briggs, Srikanth Iyengar, Josh Pollitz: arXiv:2007.08562, July 2020 (submitted)
  2. Local to global principles for generation time over Noether algebras: arXiv:1906.06104, June 2019 (submitted)

Current and Upcoming

Internal Representation Theory Seminar
University Bielefeld—Wintersemester 2020/21
I am organizing the internal seminar of the BIREP group.
Talk in the 'New directions in group theory and triangulated categories' Seminar
virtually—January 19, 2021
Talk in the University of Leeds Algebra Seminar
February 23, 2021
Talk at the AMS Spring Southeastern Sectional Meeting in the Special Session on Differential Graded Methods in Commutative Algebra
virtually—March 13–14, 2021
Together with Allechar Serrano López, Christian Klevdal, Peter McDonald and Sabine Lang I am organizing the conference BRIDGES for June 16–18, 2021. This conference is aimed towards early graduate students and advanced undergraduate students interested in representation theory, number theory, and commutative algebra.

Past talks.
Past conferences.
Past position, activities and resources.


jletz [at] math [dot] uni-bielefeld [dot] de
Mailing Address
Faculty of Mathematics
Bielefeld University
PO Box 100 131
33501 Bielefeld