Dr. Guido M.J. Filler, MD, PhD, FRCPC, is Professor of Pediatrics, Medicine, and Pathology at the University of Western Ontario and a leading pediatric nephrologist at the Children’s Hospital, London Health Sciences Centre. Trained at Hannover Medical School, he completed a DFG-funded postdoctoral fellowship at University College London’s Great Ormond Street Hospital and earned his PhD from Humboldt University, Berlin.

Over three decades, Dr. Filler has held senior leadership roles, including Chair of Pediatrics at Western University and Division Head at both Western and the University of Ottawa. Internationally recognized for advancing pediatric renal transplantation, he pioneered the transition from cyclosporine to tacrolimus and developed the widely used “Filler formula” for cystatin C–based GFR estimation.

Author of over 390 peer-reviewed publications with more than 14,000 citations, his research spans chronic kidney disease, pharmacokinetics, and pediatric obesity. An acclaimed educator and co-chair of the International Pediatric Nephrology Association mentorship committee, he has trained numerous specialists worldwide.

Dr. Filler’s contributions to clinical innovation, research, and policy have earned him multiple honors, including the Lawson Impact Award for Scientist of the Year, solidifying his global influence on pediatric nephrology and patient care.