DDS, MdentSci, MSD, PhD, Pediatric Dentist and Master of Dental Sciences from the University of Connecticut and Orthodontist and Master of Sciences in Dentistry from the University of Washington. Dr Castillo also has a PhD from the Peruvian University Cayetano Heredia. He is a Professor at the Department of Stomatology for Children and Adolescents, Peruvian University Cayetano Heredia (UPCH) and Affiliate Assistant Professor at the Department of Oral Health Sciences, University of Washington (UW). He is a Diplomate of the American Board of Paediatric Dentistry. and is a member of the Board of Directors of the UW Timothy A. DeRouen Center for Global Oral Health. Dr Castillo has worked in collaborative programmes between the UW and UPCH. Member of several local and international Paediatric Dentistry and Orthodontics Associations and is also part of the editorial board of local and international journals. Dr Castillo was President of IAPD from 2013 to 2015 and from 2021 to 2023, President of the Peruvian Society of Pediatric Dentistry 2005-2007 and President of the Peruvian Society of Orthodontics 2009-2011. He is Past Vice President of Latin American Pediatric Dentistry Association (ALOP).