Jan Vonk
Mathematical Institute, University of Oxford 
Picture by Leo Vonk

Publications
H. Darmon, J. Vonk Ring class fields of real quadratic fields and cuspidal values of rigid meromorphic cocycles Preprint (2018) (pdf) J. Balakrishnan, N. Dogra, S. Müller, J. Tuitman, J. Vonk Explicit ChabautyKim for the nonsplit Cartan modular curve of level 13 Annals of Math. (2) Volume 189, no. 3 (2019) (pdf) H. Darmon, J. Vonk Singular moduli for real quadratic fields: A rigid analytic approach Preprint (2017) (pdf) J. Vonk Modular eigenforms at the boundary of weight space Research in Number Theory 4:23 (2018) (pdf  journal) J. Vonk Crystalline cohomology of towers of curves Int. Math. Res. Not. (IMRN) (pdf  journal) J. Vonk Computing overconvergent forms for small primes LMS J. Comp. Volume 18, Issue 1 (2015), 250257 (pdf  journal) R. Möller, J. Vonk Normal subgroups of groups acting on trees and automorphism groups of graphs Journal of Group Theory, Volume 15, Issue 6 (2012), 831850 (pdf  journal) 
Teaching
Math 140 : Calculus I McGill University, Winter 2016 (Course outline) Math 235 : Algebra I McGill University, Fall 2016 (Course outline) Math 596 : Topics in Algebra and Number Theory McGill University, Winter 2017 The course webpage and lecture notes are here. Math 251 : Honours Linear Algebra McGill University, Fall 2017 (Course outline) 
Seminars and notes
Rational points on curves: A padic and computational perspective. Oxford, 24  29 September (2012) I coorganised (with Henri Darmon, Minhyong Kim and Alan Lauder) a conference, funded by the ERC. The conference website can be found here, with notes from all the talks. A picture of (most) participants. Deformation week Oxford, 16  19 April (2013) I coorganised (with Emily Cliff and Kristian Strømmen) a workshop, funded by the Mathematical Institute in Oxford. The webpage is here. Perverse sheaves and the decomposition theorem Oxford, Michaelmas 2014 Balázs Szendrői and I ran a perversity seminar, the webpage can be found here. JacquetLanglands and cyclic base change Oxford, Michaelmas 2014 Minhyong Kim, Andrew Wiles, and I ran an automorphic seminar, the webpage can be found here. Crystalline cohomology of towers of curves Harvard, 12 April 2017 Slides from a talk given at the Harvard Number Theory Seminar. Rigid meromorphic cocycles Barcelona, June 2017 Notes from a series of lectures on joint work with Henri Darmon. The GrossZagier formula Oxford, Michaelmas 2018 Netan Dogra and I are running a seminar on GrossZagier, the webpage can be found here. 
Code
Rigid meromorphic cocycles Last updated: 1 August 2018 Henri Darmon and I wrote a Magma package to compute spaces of rigid meromorphic cocycles, as introduced in our paper 'Singular moduli for real quadratic fields'. It computes the following objects: 1) Rigid meromorphic cocycles attached to an RM point. 2) Their cuspidal values. 3) Their RM values. 4) StarkHeegner points on elliptic curves, coming from to their parabolic lifting obstructions. The code, and some instructions, may be found here. Overconvergent modular forms Last updated: 14 April 2018 This code builds on the code of Alan Lauder. It has two main branches, which compute: 1) The computation of spaces of overconvergent modular forms at integer weights, for any prime p, as well as routines to compute eigenforms, projections, and ChowHeegner points on elliptic curves. 2) The computation of spaces of overconvergent modular forms at the boundary of weight space. The code, and some instructions, may be found here. 