Active in the Suffolk Preservation Society, Maynard rescued what he could from the disappearing timber structures of Ipswich, modernised the museum records, developed photographic records of Ipswich, maintained annual abstracts of archaeological work in the county, and enormously extended the collections of regional artefacts of all kinds.
Maynard was involved with the Suffolk Preservation Society. He preserved what remained of the timber structures in Ipswich, updated the museum documentation, documented photographs of Ipswich, recorded archaeological findings annually for the county, and significantly increased the collection of regional artifacts.