Mohammed T. Numan, MBBS, FHRS

Kimberly O’Donogue, BS, FHRS, CCDS, CDRMS

James O’Hara, PhD, PAC, FHRS, CCDS

Padraig G. O’Neill, MD, FHRS, CCDS

Mark D. O’Neill, MBChB, DPhil, FHRS

Edinrin Rae Obasare, MD, FHRS

Edmond K Obeng-Gyimah, MD, FHRS

Seil Oh, MD, PhD, FHRS

Amole O. Ojo, MD, FHRS

Toshimasa Okabe, MD, FHRS

Yasuo Okumura, MD, PhD, 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, 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

Ganiyu O. Oshodi, MD, FHRS

Ahmed F. Osman, MD, FHRS

Mohammed Najeeb Osman, MD, FHRS

Jose Osorio, MD, FHRS

Madeleine Oster, DNP, MBA, FHRS, CCDS

Matthew P. Ostrom, MD, FHRS

Ali Oto, MD, FHRS