Philip Jefferies is a charted psychologist and research fellow at the Resilience Research Centre at Dalhousie University in Canada. He specialises in programme development and evaluation, and statistical modelling techniques on platforms such as R, MPlus, RUMM2030 and SPSS. His research focuses on resilience, wellbeing and mental health. He has revised and produced resilience measures for use with youth and adults, drawing on classical test and item response theory. He has authored and co-authored more than 30 peer-reviewed journal articles and he also does consultancy work.