Michael Lehn
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.
15 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 (47)
fortran10
blas10
render10
lapack10
root-finding10
scientific-computing10
linear-algebra10
dialog9
api9
eigen9
markup8
termcap8
lua8
vim8
neovim8
Programming languages (9)
Github contributions (5)
michael-lehn/ulm-on-ice
Jan 2023 - Nov 2025
Contributions:85 pushes, 2 branches in 2 years 10 months
michael-lehn/ulm-generator
May 2022 - Jun 2022
Contributions:96 commits, 124 pushes, 2 branches in 1 month
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