Some recent talks:

- Public Lecture: The illustrated field diary of a mathematical naturalist [ odp (libreoffice Impress; original version) : pptx (power point conversion; haven’t tried it; YMMV) : pdf (exported; colours ruined, videos cropped; YMMV) ]
- AMS Invited Address: An Illustration in Number Theory
- Farey Colloquium – starting with Farey fractions, heading to the complex plane
- Some Arithmetic Aspects of Ring-LWE – a brief talk on a recent paper
- Quantum Computing and the Future of Cryptography – this was given at the Harvard Open Neighbourhood Seminar (for undergraduates), and explain’s Shor’s algorithm and isogeny-based cryptography
- Orienteering on Isogeny Graphs – a talk at PCMI on some recent papers.