I knew that name (author, and lisp) was familiar: https://issues.chromium.org/issues/40054453
For additional context (I think some was lost on a bug tracker migration), he's the author of https://gitlab.com/akihe/radamsa, a fuzzer implemented in owl, that was quite popular finding vulns in the chrome codebase some time ago...
I just found out there's a rust port: https://github.com/microsoft/rusty-radamsa