has been involved in the diagnosis and in the medical follow-up of patients with genetic syndromes like Cornelia de Lange syndrome since 1990. He is working at Telethon and wrote many articles and other publications on CdLS and other genetic syndromes and is pediatric expert on gastro-oesofageal reflux disease in CdLS. 

He is a pediatrician and medical geneticist working in a pediatric department at ASST Lariana, Como, Italy. 

is currently researching early intervention, behaviour disorders in people with severe intellectual disability and autism spectrum disorder, behavioural phenotypes in genetic syndromes and neuropsychological and behavioural assessment for people with severe intellectual disability. 

He is Professor of Neurodevelopmental Disorders at the University of Birmingham and Director of the Cerebra Centre for Neurodevelopmental Disorders.

He was trained as a clinical psychologist at Edinburgh University before completing a PhD on self-injurious behaviour in people with intellectual disability at the Institute of Psychiatry, London. 

After Peter completed his PhD in Marburg, Berlin and Munich, he specialized in neurology and psychiatry in Zürich, Heidelberg and Freiburg. Working at the Centre for Epilepsy at Kehl-Kork, he was able to establish a special department for adults with intellectual disabilities since 2009 at the Séguin clinic and since 2013 additionally a Medical Centre for Adults with Disabilities (MZEB).

Being medical director at Kehl-Kork, he also teaches students at Freiburg University faculty of medicine since 2005 and since 2014 is professor and member of the faculty.

Furthermore, he is one of the editors of the specialist journal „Inklusive Medizin“, member of board of directors of several specialist associations for medicine for adults with disabilities (DGMGB, MAMH and D-A-CH-Inklusive Medizin) and of the advisory committee of the foundation „Leben pur“.