Dr. Johnson received her undergraduate training in economics from Nottingham University in England, and her Master's in Economics from the University of Houston. She completed a PhD in Health Economics/Health Services Research from the University of Texas Health Science Centre, School of Public Health, in Houston. Subsequently she worked as Assistant Professor at the Centre for AIDS Intervention Research, Medical College of Wisconsin, Milwaukee, Wisconsin. She then went to McMaster University, where she obtained a CIHR Career Award. Dr. Johnson went to Queen's University as Canada Research Chair in Health Policy. She is the former site director of the Institute for Clinical Evaluative Sciences (ICES) Queen's Health Services Research Facility, and is a Professor in the Department of Public Health Sciences.