Amole O. Ojo, MD, FHRS

Toshimasa Okabe, MD, FHRS

Melissa Olen, MSN, FHRS, CCDS

Jeffrey E. Olgin, MD, FHRS

Mario M. Oliveira, MD, PhD, FHRS

Brian Olshansky, MD, FHRS, CCDS

Jeffrey A. Olson, DO, FHRS

Nicholas Olson, MD, FHRS

Razali Omar, MD, FHRS

Samuel Omotoye, MD, FHRS

Young Keun On, MD, PhD, FHRS

James J. Ong, MD, FHRS

Afamefuna Onuora, MD, FHRS

Santosh S. Oommen, MD, FHRS

Hakan Oral, MD, FHRS

David J. Orenstein, FHRS, CCDS, CEPS

Ganiyu O. Oshodi, MD, FHRS

Mohammed Najeeb Osman, MD, FHRS

Ahmed F. Osman, MD, FHRS

Jose Osorio, MD, FHRS

Madeleine Oster, DNP, MBA, FHRS, CCDS

Matthew P. Ostrom, MD, FHRS

Ali Oto, MD, FHRS

Linda K. Ottoboni, PhD, CNS, FHRS, CCDS

Armen Ovsepian, MD, FHRS

I. Eli Ovsyshcher, MD, PhD, FHRS

Joseph S. Owen, Jr., MD, FHRS

Andrew W. Owens, MD, FHRS

Olusegun Oyenuga, MD, FHRS

Douglas L Packer, MD, FHRS

Benzy J. Padanilam, MD, FHRS

Richard L. Page, MD, FHRS