

I am Junior Professor in the Algebra and Number Theory group at the Department of Mathematics, of Universität Hamburg. I am PI at the new Collaborative Research Conter on "Higher Structures, Moduli and Integrable Systems"". 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. 

Contact 
Julian Holstein Fachbereich Mathematik Bundesstrasse 55 20146 Hamburg Germany Room 336, Geomatikum
Email: julian.holstein, unihamburg.de 
Research 
My research interests lie at the intersection of algebraic geometry and algebraic topology with higher category theory and homotopical algebra. 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 unless noted otherwise. The last three papers are based on my PhD thesis Morita Cohomology. My advisor was Ian Grojnowski. 
Seminars 
Together with Birgit Richter I run a research seminar on algebraic topology (paused for summer semester 2023). Together with Craig Lawrie and Ingo Runkel I organize the ZMP Colloquium on mathematical physics and the ZMP Seminar on Quantum Physics and Geometry. 
Teaching 
In Wintersemester 2023 I am teaching Linear Algebra I (Bachelor) and in Sommersemester 2024 I will teach Linear Algebra II. In Sommersemseter 2023 I was teaching Algebraic Topology (Master). In Wintersemester 2022/23 I taught a Proseminar "Mathematik und Alltag". In Sommersemester 2022 I taught Seminar über Topologie (Bachelor) on topology and groups. In Wintersemester 2021/22 I taught Topologie (Bachelor). In Sommersemester 2021 I taught a Proseminar über Zahlentheorie (LPSI). In Wintersemester 2020/21 I taught a course on Rational Homotopy Theory (Master). In Sommersemester 2020 I taught a Seminar über Topologie (Bachelor) on de Rham cohomology. In Wintersemester 2019/20 I taught Topologie (Bachelor) at Universität Hamburg. In Lent Term 2015 I lectured a Part III course, Homological and Homotopical Algebra at University of Cambridge. 
Family 
My mother is Susannne Holstein, she is an artist. 