Concerning 2-loop calculations there are or were
Lars Bruecher,
who provided the shell for XLOOPS, and is now in Lisboa (or elsewhere),
Johannes
Franzkowski, who has left physics, he was the first to write 2loop
code for XLOOPS.
Alexander Frink,
who provided, in his diploma
thesis and his PhD,
2-loop 3-point functions for XLOOPS,
and is one of the developers of
GiNaC,
Richard Kreckel,
who works on 2-loop 4-point Functions since his
diploma,
amongst other things like GiNaC,
Christian Bauer, who worked
on GiNaC in his diploma
thesis as well and now will do some two-loop work in his PhD.
Then, there are the students who work(ed) with me on Hopf algebras
and renormalization theory,
Isabella Bierenbaum,
who finished her diploma
thesis, and now works in a similar direction in her PhD
Mathias Mertens,
who finished his PhD, and is now in the financial world
Oliver Welzel
who found other things to do after his diploma thesis
Kurusch Ebrahimi Fard from Bonn University who works on Rota-Baxter algebras,
Igor Mencattini who works on insertion-elimination Lie algebras
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