Catherine Clase completed degrees in pathology and in medicine at Christ’s College, Cambridge, UK, before moving to Canada for clinical training in internal medicine (Memorial University of Newfoundland), nephrology and health research methodology (McMaster University). Between 1997 and 2001 she was an assistant professor at Dalhousie University. She returned to McMaster University in 2001, where she is currently a professor of medicine in the division of nephrology, and an associate member of the department of health research methods, evidence and impact. Research interests include the population epidemiology of chronic kidney disease (CKD), optimization of medical management in CKD, and the prevention of thrombotic and bleeding complications in people with CKD. In 2019 she co-chaired the Canadian commentary on KDIGO metabolic bone disease guidelines and co-chaired the KDIGO potassium controversies conference. She is medical lead for the St Joseph’s Hamilton Healthcare program for transitioning young people with kidney disease from pediatric to adult practice. She is editor in chief of the Canadian Journal of Kidney Health and Disease (CJKHD). In the pandemic, she co-led a review of the filtration properties of cloth masks, co-created the plain language website www.clothmasks.ca, and works as faculty within the newly-formed Centre of Excellence in Protective Equipment and Materials at McMaster University to improve and promote cloth masks.