I am a Professor in the Discrete Mathematics Research Group of the School of Mathematical Sciences at Monash University in Melbourne, Australia. I am co-Director of the Mathematical Research Institute MATRIX.

My research interests lie in discrete mathematics and theoretical computer science, especially structural graph theory, extremal graph theory, geometric graph theory, graph colouring, graph drawing, and combinatorial geometry. Here are a few of my favourite open problems.

#### News and Events

- Joined the Steering Committee of the Free Journal Network, February 2018.
- 2018 Barbados Graph Theory Workshop, April 2018
- New paper Seymour's conjecture on 2-connected graphs of large pathwidth with Tony Huynh, Gwenaël Joret and Piotr Micek, January 2018.
- 5th International Combinatorics Conference, Monash University, December 2017
- Banff Workshop on Geometric and Structural Graph Theory, August 2017
- New paper Clustered colouring in minor-closed classes with Sergey Norin, Alex Scott and Paul Seymour, August 2017
- New paper Bad news for chordal partitions with Alex Scott and Paul Seymour, July 2017
- Oxford One-Day Meeting in Combinatorics, May 2017
- New paper Improper colourings inspired by Hadwiger's conjecture with Jan van den Heuvel, April 2017