The phrase "renowned cardiologist" means a highly respected and well-known doctor who specializes in the study and treatment of heart diseases. Full definition
,» Joseph S. Alpert, M.D., an internationally renowned cardiologist, noted the importance and timeliness of these findings and commented on how his father, a dentist, had told him even before he went to medical school, that dental health may affect heart attacks and strokes. (sciencedaily.com)
Eric Topol, at Scripps, who's also a renowned cardiologist, sounds a similar cautionary note. (fortune.com)
At mbg revitalize this year, Dr. Steven Gundry, a renowned cardiologist and author of The Plant Paradox, explained that «Our ancestors didn't crawl out of their cave and say «What's for breakfast?» (mindbodygreen.com)