Dr. Leung graduated from Creighton University School of Medicine in Omaha Nebraska. He completed his internship at the University of Iowa Hospitals and Clinics, and internal medicine residency and Nephrology fellowship at the Mayo Clinic in Rochester Minnesota. He joined the staff in the division of Nephrology and Hypertension in 2000 and has an academic rank of professor of medicine. He later joined the Division of Hematology and has a joint appointment in both divisions since 2010. He is the current program director of the OncoNephrology fellowship at the Mayo Clinic. His main interest is in monoclonal gammopathy related kidney diseases and amyloidosis. He has written extensively on renal amyloidosis, myeloma cast nephropathy and monoclonal immunoglobulin deposition disease. He introduced the concept of monoclonal gammopathy of renal significance and has made substantial contributions in the treatment of paraprotein related kidney diseases. He is the ex-president of the International Kidney and Monoclonal Gammopathy Research Group and an active member of the International Myeloma Working Group, and the treasurer of the International Society of Amyloidosis and American Society of Onconephrology. He is a current member of the American Society of Nephrology Workforce and Training Committee and the co-chair of the ASN core curriculum for Onconephrology. He sits on the editorial board of Journal of Nephrology and is a reviewer for multiple Hematology and Nephrology journals.