Author and maintainer of the following LaTeX packages:

• refstyle: Provides a consistent way of producing references throughout a project.
• sistyle: Typesets SI units, numbers and angles according to the ISO requirements. This packagage is now superceded by SIunitx.
• mattens: Contains the definitions to typeset vectors and tensors
• stellenbosch: Provids a thesis style (usthesis) for the University of Stellenbosch, as well as support packages.

I also maintains the booktabs package.