### Hi!

I am a PhD student in the topology group at the University of Oxford, supervised by Marc Lackenby.
Before this, I most recently worked at the Machine Learning Research Group, Data61, CSIRO in Australia, after completing my undergraduate degree at the Australian National University.

I am particularly interested in low-dimensional and geometric topology.
I am also interested in the mathematical foundations of machine learning and topological data analysis.

My email is [firstname].[lastname]@maths.ox.ac.uk.

### Things I’ve written

#### UMAP

UMAP is a new dimension reduction technique that finds a representation with similar topological properties to the original data.
I wrote up a set of notes on the mathematics behind UMAP, which is mostly category theory and topology, for people who have not seen much of these before.

You can download my notes on the mathematics of UMAP.

#### Presentations of the Mapping Class Group (my honours thesis)

I wrote my honours thesis, supervised by Joan Licata, on two presentations of the mapping class group.

The mapping class group is an important algebraic invariant of a surface. Presentations of this group have wide applications to low-dimensional topology. I explicitly constructed Hatcher and Thurston’s finite presentation with Dehn twist generators for genus one and two surfaces. I also extended Bene’s chord slide generators from surfaces with connected boundary to those with disconnected boundary. This presentation arises from studying a cell decomposition of Teichmüller space whose vertices are fatgraph decorations of surfaces.The resulting fatgraph presentation of the mapping class group can be converted to one with chord slide generators. This chord slide presentation has potential applications to computing bordered Heegaard Floer invariants for open books with disconnected binding.

I am in the process of finishing off some of this work and writing it up in a (much) more concise form.

### Interviews etc.

I was interviewed about my mathematical interests for Plus magazine.