My research concerns various aspects of homotopy theory, and I am particularly interested in questions relating to (parametrized) higher category theory, (global) equivariant homotopy theory, algebraic K-theory, and the interactions between these subjects.

Publications and preprints

1. Norms in Equivariant Homotopy Theory
   joint with Sil Linskens and Phil Pützstück
   preprint, 105 pages
   arXiv:2503.02839

2. Universality of Barwick’s Unfurling Construction
   joint with Bastiaan Cnossen and Maxime Ramzi
   preprint, 15 pages
   arXiv:2502.18278

3. Normed Equivariant Ring Spectra and Higher Tambara Functors
   joint with Bastiaan Cnossen, Rune Haugseng, and Sil Linskens
   preprint, 64 pages
   arXiv:2407.08399

4. Parametrized (Higher) Semiadditivity and the Universality of Spans
   joint with Bastiaan Cnossen and Sil Linskens
   preprint, 75 pages
   arXiv:2403.07676

5. Homotopical Commutative Rings and Bispans
   joint with Bastiaan Cnossen, Rune Haugseng, and Sil Linskens
   to appear in J. Lond. Math. Soc., 37 pages
   arXiv:2403.06911

6. The Adams Isomorphism Revisited
   joint with Bastiaan Cnossen and Sil Linskens
   Math. Z. 308 No. 2 (2024), Paper No. 33, 32 pp.
   published version   arXiv:2311.04884

7. Simplicial *-Modules and Mild Actions
   joint with Anna Marie Schröter
   Homology Homotopy Appl. 26 No. 2 (2024), pp. 229–258
   published version   arXiv version (arXiv:2307.11002)

8. Partial Parametrized Presentability and the Universal Property of Equivariant Spectra
   joint with Bastiaan Cnossen and Sil Linskens
   to appear in Trans. Amer. Math. Soc., 63 pages
   arXiv:2307.11001

9. Global Model Categories and Topological André-Quillen Cohomology
   joint with Michael Stahlhauer
   to appear in Trans. Amer. Math. Soc., 79 pages
   arXiv:2302.06207

10. Parametrized Stability and the Universal Property of Global Spectra
    joint with Bastiaan Cnossen and Sil Linskens
    preprint, 110 pages
    arXiv:2301.08240

11. Genuine Versus Naïve Symmetric Monoidal G-Categories
    Doc. Math. 28 No. 5 (2023), pp. 1079–1161
    published version   arXiv version (arXiv:2203.02277)

12. Global Algebraic K-Theory is Swan K-Theory
    preprint, 53 pages
    arXiv:2202.07272

13. Categorical Models of Unstable G-Global Homotopy Theory
    Cah. Topol. Géom. Différ. Catég. 64 No. 4 (2023), pp. 439–481
    published version   arXiv version (arXiv:2109.02067)

14. G-Global Homotopy Theory and Algebraic K-Theory
    Mem. Amer. Math. Soc. 306 No. 1545 (2025), v + 246 pp.
    published version  arXiv version (arXiv:2012.12676)

15. On the Global Homotopy Theory of Symmetric Monoidal Categories
    New York J. Math. 29 (2023), pp. 635–686
    published version   arXiv version (arXiv:2009.07004)

16. Parsummable Categories as a Strictification of Symmetric Monoidal Categories
    Theory Appl. Categ. 37 (2021), Paper No. 17, pp. 482–529
    published version   arXiv version (arXiv:2006.15068)

17. Homotopy (Pre)Derivators of Cofibration Categories and Quasicategories
    Algebr. Geom. Topol. 18 No. 6 (2018), pp. 3601–3646
    published version (doi:10.2140/agt.2018.18.3601)  arXiv version (arXiv:1712.07845)

Teaching

Summer 2025

• Graduate seminar Lie Groups and Their Representations
  with Jack Davies

• Assistant for lecture Topology II (lecturer: Stefan Schwede)

• Bachelor thesis seminar
  joint with the rest of the topology group

Winter 2024/25

• Assistant for lecture Topology I (lecturer: Stefan Schwede)

• Assistant for lecture Einführung in die Algebra (lecturer: Gebhard Martin)

Teaching in previous terms

Fall 2023 (Utrecht)

• Lecture course Bewijzen in de Wiskunde (Proofs in Mathematics)
  with Johan Commelin, Mireia Martínez i Sellarès, Lennart Meier, Guido Terra-Bleeker, and Marieke van der Wegen

Summer 2022 (Bonn)

• Lecture course Selected Topics in Topology: Homotopy Coherent Algebraic Structures

• Seminar Topologische Anwendungen algebraischer K-Theorie (Applications of Algebraic K-Theory in Topology)
  with Stefan Schwede

Winter 2021/22 (Bonn)

• Graduate seminar Lie Groups and Their Representations
  with Stefan Schwede

• Assistant for the lecture Topology I (lecturer: Daniel Kasprowski)