I am a PhD student under supervision of Ben Moonen. My main interest lies in algebraic geometry and algebraic number theory. I am funded by NWO project 613.001.207 (*Arithmetic and motivic aspects of the Kuga–Satake construction*).

Current research topics include: Hodge theory, reductive groups and their representations, `p`-adic Hodge theory, Galois representations, motives.

@: | `j.commelin` (funny symbol) `math.ru.nl` |
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P: | +31 (0)24 365 2865 |

A: | HG 03.724 Huygens Gebouw Heyendaalseweg 135 6525 AJ Nijmegen |

Seminar | Semester |
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Mixed Homotopy Theory Seminar (with Joost Nuiten) | Spring 2015 |

Local Langlands Microsymposium (with Milan Lopuhaä) | 27 January 2015 |

Local Langlands Seminar (with Milan Lopuhaä) | Autumn 2014 |

PhD Colloquium | Spring 2014 – now |

Basic Notions Reading Group | Autumn 2013 |

As teaching assistant in Nijmegen:

Course | Semester |
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Calculus 3&4 | Spring 2015 |

Abelian Varieties | Autumn 2014 |

Rings and Fields | Spring 2014 |

As teaching assistant in Leiden:

Course | Semester |
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Algebra 1 | Spring 2013 |

Algebra 3 | Spring 2013 |

Seminar on Commutative Algebra | Spring 2012 |

Algebra 1 | Spring 2012 |

Projective Geometry | Spring 2012 |

Analysis 3 (physics) | Autumn 2011 |

- 27 May 2015
- Mixed Homotopy Theory — Motivic cohomology. Notes
- 6 May 2015
- Mixed Homotopy Theory — Smooth and étale morphisms. Notes
- 15 Apr 2015
- Mixed Homotopy Theory — Intro to schemes and their basic properties. Notes
- 11 Dec 2014
- Local Langlands seminar — Weil–Deligne representations. Notes
- 13 Nov 2014
- Local Langlands seminar — Functional equation for GL
_{2}and cuspidal local constants. Notes - 23 Oct 2014
- Abelian Varieties — Finite group schemes. Notes
- 3 Mar 2014
- PhD colloquium (RU) — What is a motive? Notes
- 3 Dec 2013
- Seminar on Étale Cohomology — Étale cohomology of fields. Notes
- 16 Jul 2013
- Master's thesis defense — Algebraic cycles, Chow motives, and
`L`-functions - 18 Mar 2013
- Topics in Algebraic Geometry — Good reduction. Notes
- 11 Feb 2013
- Topics in Algebraic Geometry — Projective and noetherian schemes.
- 26 Apr 2012
- Commutative Algebra seminar — Derivations and Differentials. Notes
- 26 Mar 2012
- Topics in Algebraic Geometry — The structure of
`[N]`II. Notes - 19 Mar 2012
- Topics in Algebraic Geometry — The structure of
`[N]`I. Notes

I wrote my master's thesis, titled Algebraic cycles, Chow motives, and L-functions, in the spring of 2013 under the supervision of Robin de Jong.

I wrote my bachelor's thesis, titled Tannaka Duality for Finite Groups, in the spring of 2011 under the supervision of Lenny Taelman.

- Superficie algebriche. (Together with Pieter Belmans.) le superficie algebriche is a tool for studying numerical invariants of minimal algebraic surfaces over the complex numbers. We implemented it in order to better understand the Enriques–Kodaira classification, and to showcase how mathematics can be visualised on the web.
- Sloganerator. Together with Pieter Belmans I wrote a web-app that makes it easy to suggest slogans for tags (results) in the Stacks Project.