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. Managing Physician
Cathrine E. Keller, M.D.
- Managing Physician
- 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

Joseph S. Gurinsky, M.D.
Joseph S. Gurinsky, M.D.
- 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.
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

Manoj Bhatia, M.D.
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.
- 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

Mahrad Paymani, M.D.
Mahrad Paymani, M.D.
- Medical Degree: University of North Carolina School of Medicine at Chapel Hill
- Residency: Diagnostic Radiology, University of Pittsburgh
- Fellowship: Vascular and Interventional Radiology, Pittsburgh Vascular Institute
- Certificate of Added Qualification: Vascular and Interventional Radiology

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

Rosendo D. Diaz, M.D.
Rosendo D. Diaz, M.D.
- Medical Degree: University of Miami School of Medicine
- Residency: Chief Resident, Diagnostic Radiology, Jackson Memorial Medical Center, University of Miami
- Fellowship: Neuroradiology – Columbia University of Physicians and Surgeons, New York; Neuroradiology – Jackson Memorial Medical Center, University of Miami
- Certificate of Added Qualification: Neuroradiology

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.
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.
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.
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

David E. Bajayo, M.D.
David E. Bajayo, M.D.
- Medical Degree: Universidad Central de Venezuela Caracas; General Surgery Hospital Universitario de Caracas
- Residency: Diagnostic Radiology with Subspecialty in Trauma/ER and General Surgery, University of Miami Jackson Memorial Hospital

J. Scott Carroll, M.D.
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

Romil Y. Patel, M.D.
Romil Y. Patel, M.D.
- Medical Degree: Mount Sinai School of Medicine
- Residency: Diagnostic Radiology, St. Luke’s –Roosevelt Hospital Center, University Teaching Hospital of Columbia College of Physicians and Surgeons
- Fellowship: Musculoskeletal Imaging, University of Texas MD Anderson Cancer Center

Keith Kastelic, M.D.
Keith A. Kastelic, M.D.
- Medical Degree: University of Illinois, Peoria
- Residency: Diagnostic Radiology, University of Missouri, Kansas City

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

Kenneth Mandato, M.D.
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