Our Physicians

For 55 years, Lake Medical Imaging has earned our standing as one of the most respected diagnostic imaging practices in the country.

We continue to garner national recognition for our quality of patient care and safety from some of the field’s most respected professional organizations.

We have grown to be one of a few full-service radiology practices specializing and fully accredited in MRI, CT, PET/CT, Women’s Imaging, Nuclear Medicine, and Interventional Radiology.

Meet Our Physicians

Cathrine E. Keller, M.D.

Cathrine E. Keller, M.D.

Immediate Past President and Managing Physician (2005-January 6, 2023)
Medical Degree: University of Chicago, Pritzker School of Medicine
Residency: Chief Resident, Diagnostic Radiology, Henry Ford Hospital, Detroit
Fellowship: Neuroradiology, University of Miami, Jackson Memorial Medical Center

Michael S. Levine, M.D. / Part-time

Michael S. Levine, M.D.

Michael S. Levine, M.D. / Part-time

Medical Degree: SUNY – Upstate Medical Center, Syracuse, New York
Residency: Chief Radiology, Mount Sinai Medical Center, Miami Beach, Florida
Radiology, Medicine, SUNY – Upstate Medical Center, Syracuse, New York
Fellowship: Interventional Radiology, University of Lund, Lund, Sweden
Board Certification:
American Board of Nuclear Cardiology
American Board of Diagnostic Radiology
American Board of Internal Medicine

Joseph S. Gurinsky, M.D. / Part-time

Joseph S. Gurinsky, M.D.

Joseph S. Gurinsky, M.D. / Part-time

Medical Degree: University of Miami School of Medicine
Residency: Chief Resident, Nuclear Medicine, and Resident, Diagnostic Radiology, University of Miami, Jackson Memorial Medical Center
Fellowship: CT, Ultrasound, Nuclear Medicine and MRI, Mount Sinai Medical Center
Additional Board Certification: Nuclear Medicine

David C. Weyn, M.D.

Medical Degree: Jefferson Medical College, Philadelphia
Residency: Internal Medicine, Cooper Hospital, University Medical Center, Camden; Diagnostic Radiology, Albert Einstein Medical Center, Philadelphia

Marc S. Schwartzberg, M.D.

Marc S. Schwartzberg, M.D.

Medical Degree: University of North Carolina at Chapel Hill
Residency: Chief Resident, Diagnostic Radiology, University of Alabama
Fellowship: Angiographic and Interventional Radiology, University of Alabama

CERTIFICATE OF ADDED QUALIFICATION: VASCULAR AND INTERVENTIONAL RADIOLOGY

Manoj Bhatia, M.D.

Medical Degree: Northwestern University Medical School
Residency: Diagnostic Radiology, Medical University of South Carolina
Fellowship: Musculoskeletal and Body MRI, Thomas Jefferson University

George E. Kainz, M.D.

George E. Kainz, M.D. / President and Managing Physician

George E. Kainz, M.D.

President and Managing Physician
Medical Degree: University of Miami School of Medicine
Residency: Chief Resident, Diagnostic Radiology, Robert Wood Johnson Medical School, Camden
Fellowship: Abdominal and Cross-Sectional Body Imaging, Temple University Hospital, Philadelphia

Pairoj Sae Chang, M.D. Ph.D.

Medical Degree: Loma Linda University School of Medicine, California; Ph.D. Biochemistry, Molecular Biology, Loma Linda University
Residency: Resident, Internal Medicine and Co-Chief Resident, Diagnostic Radiology Loma Linda University Medical Center
Fellowship: Vascular and Interventional Radiology, Loma Linda University Medical Center
Certificate of Added Qualification: Vascular and Interventional Radiology

Yi Liu, M.D., Ph.D.

Yi Liu, M.D. Ph.D.

Medical Degree: Capital University of Medical Sciences, Beijing, China; Ph.D., Neuroscience, Hahnemann University, Philadelphia
Residency: Department of Radiology, Hospital of University of Pennsylvania; Department of Surgery, Long Island Jewish Medical Center; Department of Neurosurgery, Beijing Tian Tan Hospital, Beijing

Richard K. Held, M.D.

Medical Degree: Ross University School of Medicine, Edison, New Jersey
Residency: Internal Medicine and Diagnostic Radiology, Norwalk Hospital, Norwalk, Connecticut
Fellowship: Nuclear Medicine Mallinckrodt Institute of Radiology, St. Louis, Missouri
Additional Board Certification: Nuclear Medicine

Anton Serafini, M.D.

Medical Degree: University of Miami School of Medicine
Residency: Chief Resident, Nuclear Medicine, and Resident, Diagnostic Radiology, University of Miami, Jackson Memorial Hospital
Fellowship: Nuclear Medicine University of Miami
Additional Board Certification: Nuclear Medicine

J. Laird McMullen, III, M.D.

Medical Degree; University of South Florida College of Medicine
Residency: Co-Chief Resident, Diagnostic Radiology, University of South Florida College of Medicine
Fellowship: Interventional Radiology, University of Virginia Health System

CERTIFICATE OF ADDED QUALIFICATION: VASCULAR AND INTERVENTIONAL RADIOLOGY

J. Scott Carroll, M.D.

Medical Degree: Medical University of South Carolina
Residency: Diagnostic Radiology, Baptist Memorial Hospital, Memphis
Fellowship: Musculoskeletal Radiology, Case Western Reserve, Cleveland

Keith Kastelic, M.D.

Keith Kastelic, M.D.

Keith A. Kastelic, M.D.

Medical Degree: University of Illinois, Peoria
Residency: Diagnostic Radiology, University of Missouri, Kansas City

Chiedozie A. Mkpolulu, M.D.

Chiedozie “Tony” Mkpolulu, M.D.

Chiedozie A. Mkpolulu, M.D.

Medical Degree: University of Calabar, Nigeria
Residency: Diagnostic Radiology, Baystate Medical Center, Springfield, Massachusetts
Fellowship: Cross Sectional Imaging, Johns Hopkins University, Baltimore

Brittany Nagy, M.D.

Brittany Nagy, M.D.

Medical Degree: Drexel University College of Medicine, Philadelphia
Residency: Diagnostic Radiology, Emory University School of Medicine, Atlanta
Fellowship: Vascular and Interventional Radiology, University of Florida College of Medicine

Marcus Kessler, M.D.

Medical Degree: Medizinische Fakultat, University of Cologne, Germany
Residency: Nuclear Medicine, Mallinckrodt Institute of Radiology, St. Louis;

Diagnostic Radiology, Pediatric Hospital Amsterdamer Strasse, University of Cologne, Germany; Diagnostic Radiology and Nuclear Medicine, Hospital Cologne-Holweide, Germany
Fellowships: Nuclear Medicine, The University of Arkansas for the Medical Sciences, Little Rock; Neuroradiology and Pediatric Radiology, Mallinckrodt Institute of Radiology, St. Louis

David Factor, M.D.

David Factor, M.D

David Factor, M.D.

Medical Degree: Rush Medical College, Chicago, IL
Residency: Radiology, Tripler Army Medical Center

Kenneth Mandato, M.D.

Medical Degree: Boston University School of Medicine, Boston
Residency: Diagnostic Radiology, State University of New York, Stony Brook
Fellowship: Cardiovascular and Interventional Radiology, Albany Medical Center Hospital,
Albany, NY

Stephen Z. Grahovac, M.D.

Medical Degree: University of Ottawa Medical School, Ottawa, Canada
Residency: Diagnostic Radiology, Ottawa General Hospital, Ottawa, Canada
Fellowship: Neuroradiology, McGill University Montreal Neurological Institute,
Montreal, Canada

Steven Hwang, D.O.

Medical Degree: A.T. Still University, School of Osteopathic Medicine, Mesa, AZ
Residency: Chief Resident, Diagnostic Radiology, Larkin Community Hospital, South Miami, FL
Fellowship: Body/Abdominal Radiology, University of Colorado School of Medicine, Aurora, CO

Rafik Ben Abda, D.O.

Medical Degree: Des Moines University, School of Osteopathic Medicine, Des Moines, IA
Residency: Diagnostic Radiology, Madigan Army Medical Center, Tacoma, WA
Fellowship: Neuro Radiology, Yale University, New Haven, CT