I'd like to nominate Akos Kitta as a committer to the Xtext project.
Akos has contributed various, valuable, high quality changes to Xtext (specially the LSP part, e.g. the Semantic Highlighting and Outline support).
Having him as a committer would be a great opportunity for the project.
See his list of contributions:
https://github.com/search?q=author%3Akittaakos+is%3Apr+repo%3Aeclipse%2F...
Kind Regards, Christian