Michael Lehn
Software Engineer at Ulm University
Ulm, Baden-Württemberg, Germany
Summary
👤
Senior🎓
Top SchoolMichael Lehn is a software engineer and applied mathematician with 14 years of experience focused on high-performance numerical computing. He is the developer of FLENS, a C++ scientific computing library, and authored a widely used 13-step GEMM optimization tutorial and teaching framework (ulmBLAS) that guides students from naive implementations to micro-kernels rivaling Intel MKL. His work blends deep mathematical training (Dr. rer. nat. from Universität Ulm and an MSc from USC) with practical low-level performance engineering on x86-64 SSE. Michael teaches and documents what often remains opaque in numerical libraries—how small, targeted changes in a micro-kernel unlock dramatic, cache-aware performance gains. Based in Ulm, Germany, he describes himself succinctly as mathematician, coder, nerd, reflecting a culture of rigorous, hands-on craftsmanship in open-source numerical software.
14 years of coding experience
Master of Science (MSc), Applied Mathematics, Master of Science (MSc), Applied Mathematics at University of Southern CaliforniaDr. rer. nat., Dr. rer. nat. at Universität Ulm
English
Stackoverflow
3,114reputation
207kreached
26answers
6questions
fortran
top-1%
eigen
top-5%
Github Skills (56)
fortran10
root-finding10
dialog9
eigen9
termcap9
scientific-computing9
render8
terminal-app8
text-editor8
tty8
console7
text-based7
readline6
cpp6
optimization6
Programming languages (7)
Github contributions (5)
michael-lehn/abc-llvm
Jan 2024 - Nov 2024
Contributions:424 pushes, 11 branches, 4 comments in 10 months
michael-lehn/ulmBLAS-core
Sep 2014 - Feb 2016
Contributions:32 commits, 20 pushes, 1 branch in 1 year 4 months
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