M. Burrow was a member of the secret scientific team of Vault 81.
Burrow was initially not a researcher for the Vault 81 science team, but rather an assistant. He was the youngest member of the team, having outlived both Collins and Flint. After both of their deaths, he continued their work on making antidotes with the assistance of Curie. Before his death, he asked Curie to continue working alone so that their deaths would not be in vain.
M. Burrow is mentioned only in Fallout 4, although his remains (complete set of bones) can be found in an improvised coffin (locker) laid in the hallway outside the lab where Curie was working (together with coffins of his other two colleagues).