Project initiator.

Developed the first versions of hilbert, graver for his Ph.D. work at the University of Duisburg, completed in 2001. The code is referred to under the name MLP (for "minimal lattice points"); later it was renamed to 4ti2.

Continued the work on 4ti2 while at UC Davis.

Continued to maintain the project while at the University of Magdeburg, TU Darmstadt, and TU Munich.

Credited as coauthor for early 4ti2 code, some of which is still part of 4ti2 in src/util

Wrote ppi (1998) while at the University of Magdeburg, which was later included in 4ti2.

Updated the build system.

Current de facto maintainer; contact: mkoeppe+4ti2@math.ucdavis.edu

Developed the current version of groebner, qsolve, etc., while at CORE, UC Louvain, Belgium and at UC Davis, CA, USA.

Developed the C API of 4ti2.

Wrote the current version of zsolve, including hilbert, graver.