Ryan is a perinatal psychiatrist with more than 10 years of experience treating women with psychotherapy and/or medications during pregnancy and the postpartum period. He wrote the Canada’s national clinical practice guidelines for the treatment of perinatal depression and co-authored Public Health Ontario’s Perinatal Mental Health Toolkit. He has published more than 170 papers on maternal perinatal health and offspring neurodevelopment in scientific journals and is the Canada Research Chair in the Perinatal Programming of Mental Disorders at McMaster University. He has a 4-year-old daughter and lives just outside of Hamilton.