Mihály Tapolyai, MD, Ph.D., FASN, FACP, works at Szent Margit Hospital as a senior consultant in Budapest, Hungary. Schooled in the USA, in Boston, Massachusetts (1984 Gordon college) and Cincinnati, Ohio (1988 University of Cincinnati). Residency and fellowship at the Case Western Reserve University and at the Cleveland Clinic Foundation both in Cleveland, Ohio. I am board re-re-certified by the American Board of Internal Medicine in Nephrology, in 1996, 2007 and 2020. Additionally, I am board certified in internal medicine and nephrology by the National Board of Physicians and Surgeons. My first nephrology job was at the Mayo Clinic Jacksonville, and then I was the Acting Director of the Nephrology Department at the Cleveland Clinic Florida for 7 years. I also spent 5 years at the Louisiana State University Health Sciences Center in Shreveport, Louisiana. I was a visiting professor at Chubu Hospital in Okinawa, Japan. Although I moved to Hungary in 2010, I worked at many US military hospitals, many Veterans' Hospitals throughout the USA and also at Brooke Army Medical Center; I still have an active appointment at Ralph H. Johnson VAMC, Charleston, SC. My principal field of clinical research interest is fluid management and fluid measurement of critical care and renal patients by BNP and bioimpedance. I am a fellow of both the American society of Nephrology and the American College of Physicians in addition to being a member of the European Renal Association.