I contribute to several open source efforts, mostly Debian and R.

Besides looking after a number of Debian packages, I write and/or maintain code for a number of projects: Rcpp and RInside; RQuantLib and several more. See the code link below for details.

The work on Rcpp led to a book in Springer's useR! series. Links to a few other publications are below, as are slides from talks, workshops or lectures I have given.