Istvan is a Board Certified Nephrologist in Greenville, SC and one of the managing partners of Carolina Nephrology. He is a founding member of the Carolina Kidney Alliance, a coalition of progressive nephrology practices dedicated to promoting excellence in renal care throughout South Carolina. Istvan is also the founder and CEO of Healthcare Facility Partners, a successful medical real estate development company and has developed numerous projects throughout the South from Georgia to Oklahoma. He is a Medical Advisory Board Member for DSI Renal, a mid-sized national dialysis provider.

Istvan is a graduate of the Medical University of Pecs, Hungary. He is married and has five children with whom he spends the remainder of his spare time.