Ranieri has a veterinary degree from the University of Pisa where he also obtained his PhD with a dissertation on Porcine circovirus type 2 (PCV2) antigen localisation and postweaning multisystemic wasting syndrome (PMWS) in free-ranging wild boar (Sus scrofa ssp scrofa) in Italy. Ranieri’s research mainly focuses on wildlife pathology and diseases of free ranging wild mammals. Ranieri is Diplomate of the European College of Zoological Medicine (DipECZM) in the wildlife population health specialty. He joined the group in September 2013 and since then he has been involved in running the diagnostic histopathology and necropsy service. Ranieri became Diplomate of the European College of Veterinary Pathologists (DiplECVP) and RCVS specialist in veterinary pathology (zoo and wildlife) in 2016.