Welcome to my webpage. I am a postdoc in the working group of Prof. Chris Wendl at the Humboldt University Berlin.

From September 2014 till July 2018 I was a member of the working group of Prof. Hansjörg Geiges at the University of Cologne where I graduated in January 2017 about "Legendrian knots in surgery diagrams and the knot complement problem".

The fields of my research include low-dimensional topology, contact geometry, symplectic topology and their interactions.

**Mailing address:**

Institut für Mathematik

Humboldt-Universität zu Berlin

Unter den Linden 6

10099 Berlin

Germany

**Office:**

Rudower Chaussee 25 (Johann von Neumann-Haus)

12489 Berlin

Room : 318, Haus 1

Telephon : +49-30-2093-45426

E-Mails :

Office Hours: after the lectures

Lunch: daily at 11:30

- I will spend one semester (April 2024 - September 2024) as substitute professor at the Ruhr-University Bochum.
- We will organize a one-day workshop at FU Berlin about knot theory and its applications on Friday November 17: Berlin-Brandenburg Workshop II: Knot Theory and its Application
- I will spend one semester (September 2023 - March 2024) as substitute professor at the University Heidelberg.
- Chun-Sheng Hsueh has published his first paper on the arXiv based on his master thesis.
- Chun-Sheng Hsueh will start his Ph.D. studies funded by the Claussen-Simon Stiftung in August 2023.

**Geometric topology:** low dimensional topology, experimental mathematics, knot theory, 3-manifolds, smooth 4-manifolds, Dehn surgery, open books, Kirby calculus,
Lefschetz fibrations, trisections and Heegaard splittings.

**Differential topology:** contact and symplectic geometry, Legendrian and transverse knot theory, Engel structures, Morse theory, hyperbolic geometry.

Working group seminar on symplectic geometry

Berlin-Hamburg Seminar zur symplektischen Geometrie

Oberseminar Differentialgeometrie und Geometrische Analysis

Berlin-Brandenburg Workshop II: Knot Theory and its Application, Friday, 17 November 2023.

Berlin-Brandenburg Workshop I: Knot Theory and its Application, Friday, 14 July 2023.

DMV-Jahrestagung 2022, Section S06: Topology and Geometry, Freie Universität Berlin, September 2022.

Reading seminar: Freedman's proof of the 4-dimensional Poincaré conjecture, WS 2021/22

Learning Seminar: Computational Topology, WS 2017/18, University of Cologne

The stabilisation height of fibre surfaces, Lecture series by Filip Misev, 19 Oct - 20 Oct 2017, University of Cologne

Morse Structures on Open Books, Lecture series by Joan Licata, 17 May - 19 May 2017, University of Cologne

Connect Four on the Klein bottle (Vier gewinnt auf der Kleinschen Flasche)

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