Bill Gropp was extremely influential in the early days of PETSc. I learned numerical analysis from him as an undergraduate and was later his post-doc.
ICERM is hosting a meeting, From Modeling to Learning with HPC, Sep 13-14 2025 in honor of Bill Gropp's 70th birthday. You can find more information at https://urldefense.us/v3/__https://app.icerm.brown.edu/Cube/apply__;!!G_uCfscf7eWS!fumvXSupRQHE-gnpd_eqLI601O9rUP73OmUFZwrAcwjAnWrKE4Uyjf8WJtxTBK3uqboZQKSHaBtg3gZSEcOyy-o$ Barry
