His clinical practice focuses on osteoporosis, disorders of bone metabolism, thyroid disorders, and general endocrinology. His basic and translational research focuses on adaptations in calcium and bone metabolism that occur during reproduction and fetal development. He has received over a dozen national and international awards for excellence in research, including the 2003 Gold Medal in Medicine from the Royal College of Physicians and Surgeons of Canada; the 2003 Young Investigator Award from the Canadian Society of Endocrinology and Metabolism, and Young Investigator Awards from the American Society for Bone and Mineral Research and Advances in Mineral Metabolism. He has served on Editorial Boards of journals, CIHR and NIH grant committees, and as a reviewer for grant agencies in Canada, USA, England, Ireland, and Australia. He was also on the Institute of Medicine / National Academies of Science USA Committee to Review Calcium and Vitamin D. He was the president of Advances in Mineral Metabolism for 2015-2017. Since 2000 his graduate students have won over 60 international, national, and local awards for excellence in research, including Young Investigator Awards from the American Society for Bone and Mineral Research; a New Investigator Award from the European Calcified Tissue Society; travel awards from the International Bone and Mineral Society, American Society for Bone and Mineral Research, Japanese Society for Bone and Mineral Research, Canadian Society of Endocrinology and Metabolism, Indo-US Conference on Vitamin D, and Canadian Diabetes Association; and doctoral awards from CIHR, NSERC, and Memorial University.