Johannes Gäßler
Member of llama.cpp's CUDA backend code-owner team; experimental particle physicist at KIT
- Experimental particle physicist, Karlsruhe Institute of Technology1
- Member of the CUDA backend code-owner team (ggml-org/ggml-cuda), llama.cpp project2
Johannes Gäßler contributes to llama.cpp, the C/C++ runtime for running language models on local hardware, and the project's CODEOWNERS file lists Gäßler in the team that owns its CUDA backend. The same file names Gäßler as co-owner of the GGUF file code (gguf.cpp) and owner of the ggml optimizer code (ggml-opt.cpp) and the lookup example. Gäßler's 2026 commits to the repository cover CUDA matrix-multiplication and FlashAttention kernels, HIP tuning for AMD GPUs, and tensor-parallel fixes. Gäßler's GitHub profile gives the Karlsruhe Institute of Technology as company and describes Gäßler as an experimental particle physicist.231
Work
llama.cppOpen-source code
CODEOWNERS lists Gäßler in the ggml-org/ggml-cuda team that owns the CUDA backend, as co-owner of gguf.cpp, and as owner of ggml-opt.cpp, ggml-backend-meta.cpp, the lookup example, and common/fit. Commits authored in 2026 cover CUDA MMQ and FlashAttention kernels, HIP tuning for AMD GPUs, and tensor parallelism. The repository is MIT-licensed.234
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