Bringham and Women is also a very good place for valve surgery. Hopkins in Baltimore is another. I am more familiar with the northeast health systems. Emory has a great congenital heart disease program so I can only imagine they'd be a premiere valve surgery center. Duke would be also an option. Only issue is that I am not sure how complex your mitral valve regurgitation is. If feasible, repair is a bit more superior to a replacement so I get his thought process.