The "Who is Who in Natural History Collections?" trifold leaflet is an outcome from thePeople Identifiers workshop/hackathon organized in Oslo in January 2023 by the COST Action MOBILISE, CA17106, supported by COST (European Cooperation in Science and Technology).The leaflet points at resources tomanage biographical data in natural history collections more efficiently and contains recommendations for researchers, curators, database managers and publishers to avoid duplication of effort between collections.