I am Junior Professor for String Geometry in the Algebra and Number Theory group at the Department of Mathematics, of Universität Hamburg. I am also a member of the "Cluster of Excellence" Quantum Universe.

Before that I was a College Associate Lecturer and Fellow of St John's College, affiliated with the University of Cambridge, a Senior Research Associate at Lancaster University, a Postdoctoral Fellow at the Max Planck Institute for Mathematics in Bonn and a College Lecturer and Fellow of Christ's College.


Julian Holstein
Fachbereich Mathematik
Bundesstrasse 55
20146 Hamburg

Room 336, Geomatikum

Email: julian.holstein,


My research interests lie at the intersection of algebraic geometry and algebraic topology with higher category theory and homotopical algebra.

Send me an email if you are interested in working with me as a master's student, PhD student or postdoc!

Here is a list of my papers and preprints in reverese chronological order:

The paper title links to the arxiv, the journal title links to the published versions; there are no differences in content.

The last three papers are based on my PhD thesis Morita Cohomology. My advisor was Ian Grojnowski.


In Wintersemester 2019/20 I was teaching Topologie (Bachelor) at Universität Hamburg. Please note that the second exam has been cancelled for now. A new date will be anounced.

In Sommersemester 2020 I will run a Seminar über Topologie (Bachelor). More details will be available here soon.

In Lent Term 2015 I was lecturing a Part III course, Homological and Homotopical Algebra at University of Cambridge.


My mother is Susannne Holstein, she is an artist.