Leisch was instrumental in the early stages of the R project, joining the R Core Development Team and later serving as the first Secretary General of the
R Foundation for Statistical Computing. He developed the
Sweave system, integrating R with
LaTeX to promote reproducible research. He co-organized several seminal conferences in Vienna, namely the first three "Distributed Statistical Computing (DSC)" conferences (1999, 2001, 2003) as well as the first useR! conference in 2004. == Death ==