Supervision & Teaching

This page contains an overview of teaching and supervision activities.

Postdocs

  1. Jonathan Love Leiden, 2024 – 2026
    Postdoc on ERC Grant “GAGARIN”.
  2. Élie Studnia Leiden, 2024 – 2026
    Postdoc on ERC Grant “GAGARIN”.
  3. David Lilienfeldt Leiden, 2023 – 2025
    Edixhoven postdoc at the Mathematical Institute.

PhD students

  1. Felix Kalker Leiden, 2025 – current
    Thesis expected 2029. Funded by ERC Grant “GAGARIN”. Co-supervisor: Emre Sertöz.
  2. Beatrice Ostorero Vinci Genova / Leiden, 2024 – current
    Thesis expected 2027. Co-supervisor: Stefano Vigni.
  3. Mateo Crabit Nicolau Paris / Leiden, 2024 – current
    Thesis expected 2027. Partly funded by ERC Grant “GAGARIN”. Co-supervisor: Pierre Charollois.
  4. Paolo Bordignon Leiden, 2023 – current
    Thesis expected 2027. Funded by sectorplannen.
  5. Alex Braat Leiden, 2022 – current
    Partly funded by ERC Grant “GAGARIN”. Co-supervisor: Peter Stevenhagen.
  6. Antigona Pajaziti Luxembourg / Leiden, 2023 – 2026
    Thesis: From Kummer theory to modular curves (co-supervisor: Antonella Perucca).
    Partly funded by ERC Grant “GAGARIN”.
  7. Håvard Damm-Johnsen Oxford, 2020 – 2024
    Thesis: Diagonal restrictions of Hilbert modular forms (co-supervisor: James Newton).
    Håvard started a postdoc in Gothenburg with Christian Johansson.
  8. Mike Daas Leiden, 2020 – 2024
    Thesis: CM values of p-adic theta functions (awarded the Stieltjes Prize 2025).
    Mike started a postdoc at MPIM Bonn with Don Zagier.

Master students

  1. Shenqi Fan Utrecht, current
    Equivariant elliptic genera. Main supervisor: Lennart Meier.
  2. Rafaël Houkes Leiden, 2026
    Stark units and SIC-POVMs. Co-supervisor: Peter Bruin.
  3. Bart van Kootwijk Leiden, 2025
    Ranks in Diophantus' family of elliptic curves.
  4. Jorre The Leiden, 2025
    Quadratic forms as fppf-torsors.
    Jorre started a PhD in Mathematics in Leiden.
  5. Felix Kalker Leiden, 2025
    The Knopp cocycle and cycle integrals of the j-function.
    Felix started a PhD in Mathematics in Leiden.
  6. Emre Karayalçın Leiden, 2025
    Torsion in homology of Bianchi groups and Galois representations.
    Emre became a mathematics teacher at the International School Delft.
  7. Maarten Stremler Leiden, 2024
    Smooth differences of singular moduli.
    Maarten became a scientific researcher at the Centraal Bureau voor de Statistiek (CBS).
  8. Mateo Crabit Nicolau Paris, 2024
    Holomorphic projections and Shimura curves.
    Mateo started a PhD in Mathematics at Paris Sorbonne / Leiden.
  9. Michelle Jacobs Leiden, 2024
    Jacobi uniformization over the p-adic numbers.
    Michelle became a cloud engineer at Jongens van Techniek (Den Haag).
  10. David van der Vorm Leiden, 2024
    Torsion points on elliptic curves over ℚ.
    David became a consultant at Zicht Consultants (Utrecht).
  11. Niels Ketelaars Leiden, 2023
    A Journey Through Iwasawa Theory.
    Niels became a consultant at RiskQuest (Amsterdam).
  12. Sam van Buuren Leiden, 2022
    Spectra of supersingular isogeny graphs.
    Sam started a PhD in Mathematics at KU Leuven (Belgium).
  13. Giacomo Santato Leiden, 2021
    Zeroes of p-adic L-functions: the Ellenberg–Jain–Venkatesh conjecture (ALGANT).
    Giacomo started a PhD in Cryptography at CISPA (Saarbrücken).
  14. Giuditta Bellosi Leiden, 2021
    From Pell's equation to Gross–Stark units (ALGANT).
    Giuditta became a Business Intelligence Analyst at Sysdata SpA (Bologna).
  15. Emiel Haakma Leiden, 2021
    Heegner points and the Shimura correspondence.
    Emiel started a PhD in Mathematics at SFU (Vancouver).
  16. Jesse Freeman Oxford, 2014
    L-functions and modular symbols (Williams–Exeter Programme).
    Jesse started a PhD in Mathematics at MIT (Boston).

Undergraduate students

  1. Rik van der Linde Leiden, current
    Congruentieklassen van Apolloniaanse netten.
  2. Sibrand op de Beek Leiden, 2026
    De homologie van SL3(ℤ).
  3. Anne van der Bijl Leiden, 2026
    On (non-)congruence subgroups of SL2(ℤ).
  4. Mozes Marcus Leiden, 2025
    De Artin–Hasse machtreeks.
  5. Sjors Verduin Leiden, 2025
    Perfectoid fields and Fontaine–Wintenberger's theorem (co-supervisor: Élie Studnia).
  6. Thomas Chen Leiden, 2021
    The Leech lattice: sphere packings and the Conway groups.
    Thomas started a PhD in Biostatistics in Cambridge (UK).
  7. Kevin Watmough McGill, 2017
    p-Adic torsors and statistics of the Hilbert symbol (NSERC).
    Kevin started a PhD in Mathematics at Toronto (Canada).
  8. David Marcil McGill, 2017
    Elkies' models for towers of modular curves (NSERC).
    David started a PhD in Mathematics at Columbia (New York).
  9. Isaac Loh Oxford, 2014
    Pell-type equations and Mordell equations (Williams–Exeter Programme).
    Isaac started a PhD in Economics at Northwestern (Chicago).
  10. Christopher Huffaker Oxford, 2014
    Fermat's last theorem for regular primes (Williams–Exeter Programme).
    Christopher became a data reporter covering education in Boston.
  11. Jesse Freeman Oxford, 2013
    Class field theory of ℚ (Williams–Exeter Programme).
    Jesse started a PhD in Mathematics at MIT (Boston).
  12. CJ Higgins Oxford, 2012
    The friendship theorem and extensions (Williams–Exeter Programme).
    CJ started a PhD in Political Science at Johns Hopkins (Baltimore).
  13. Zane Martin Oxford, 2012
    Dirichlet's theorem on primes in arithmetic progressions (Williams–Exeter Programme).
    Zane started a PhD in Applied Math & Atmospheric Science at Columbia (New York).

Pre-university

I supervised two Sixth Form students at Magdalen College School (Oxford), as part of the Waynflete Studies Programme.

Teaching

Webpages with relevant material for some past and present courses.