Hildenbrand landed a patch updating the mailmap file and MAINTAINERS entries to change over to his kernel.org emaila ddress rather than using his redhat.com email address. He notes in the commit message he will be leaving Red Hat and his RedHat.com email will only remain active until January.
Source: https://www.phoronix.com/news/Red-Hat-David-H-Leaving
Source: https://www.phoronix.com/news/Red-Hat-David-H-Leaving

