People Germany Ronald Janssen peoplepill id: ronald-janssen-1RJ 10 views today 12 views this weekGerman malacologistRonald JanssenBiographyListsAlso ViewedListsRonald Janssen is in following listsBy field of workNotable German biologistsGender:MaleBy work and/or countryNotable German ZoologistsGender:MaleNotable German MalacologistsGender:MaleFrom our partnersSponsoredRonald Janssen