new Kegel

Marc Kegel

Welcome to my webpage. I am a visiting lecturer (Gastdozent) 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 Universiy 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

Rudower Chaussee 25 (Johann von Neumann-Haus)
12489 Berlin
Room : 318, Haus 1
Telephon : +49-30-2093-45426
E-Mails :

Office Hours: Due to the Corona pandemic there are currently no office hours. Please do not come to my office and contact me by e-mail instead.
Lunch: daily at 11:30


My complete CV can be accessed here.


Geometric Topology: low dimensional topology, 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.

Publications and Preprints

Teaching WS 2020/2021

Lecture Topology II (4 hours lecture + 2 hour exercise session)

Seminar Selected topics in algebraic and differential topology

Teaching SS 2021

Lecture 4-Manifolds and Kirby calculus (2 hours lecture + 1 hour exercise session, planned)

Former Teaching

I regularly attend the following seminars

Working group seminar on symplectic geometry

Berlin-Hamburg Seminar zur symplektischen Geometrie

Oberseminar Differentialgeometrie und Geometrische Analysis

MATH+ Fridays colloquium


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)


You can also find me on:

Google Scholar


Front for the arXiv





Mathematics Genealogy Project