Our Team
Meet the highly skilled adult and pediatric cardiac surgeons, thoracic surgeons and interventional pulmonologists who make up the team of experts at Inova Cardiac and Thoracic Surgery.
Lucas R. Collazo, MD
A member of Inova Medical Group
The doctors of Inova Medical Group are Inova’s premier primary care and specialty physicians,
offering top-notch medical expertise, full access to Inova facilities, and the convenience of
integrated electronic medical records.
Specialty: Thoracic and Cardiac Surgery, Congenital Cardiac Surgery
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Clinical Interests: Children's Heart, Children's Heart Surgery
Years of Experience: 31
Areas of special interest identified by the physician or additional training completed.
Alan M. Speir, MD
A member of Inova Medical Group
The doctors of Inova Medical Group are Inova’s premier primary care and specialty physicians,
offering top-notch medical expertise, full access to Inova facilities, and the convenience of
integrated electronic medical records.
Specialty: Thoracic and Cardiac Surgery
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Clinical Interests: Adult Heart Surgery
Years of Experience: 45
Areas of special interest identified by the physician or additional training completed.
Eric L. Sarin, MD
A member of Inova Medical Group
The doctors of Inova Medical Group are Inova’s premier primary care and specialty physicians,
offering top-notch medical expertise, full access to Inova facilities, and the convenience of
integrated electronic medical records.
Specialty: Thoracic and Cardiac Surgery, Surgical Critical Care
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Clinical Interests: Adult Heart Surgery
Years of Experience: 22
Areas of special interest identified by the physician or additional training completed.
Liam P. Ryan, MD
A member of Inova Medical Group
The doctors of Inova Medical Group are Inova’s premier primary care and specialty physicians,
offering top-notch medical expertise, full access to Inova facilities, and the convenience of
integrated electronic medical records.
Specialty: Thoracic and Cardiac Surgery, Surgery
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Clinical Interests: Adult Heart Surgery
Years of Experience: 18
Areas of special interest identified by the physician or additional training completed.
Ramesh Singh, MD
A member of Inova Medical Group
The doctors of Inova Medical Group are Inova’s premier primary care and specialty physicians,
offering top-notch medical expertise, full access to Inova facilities, and the convenience of
integrated electronic medical records.
Specialty: Thoracic and Cardiac Surgery, Surgery
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Clinical Interests: Adult Heart Surgery
Years of Experience: 20
Areas of special interest identified by the physician or additional training completed.
Amit K. Mahajan, MD
A member of Inova Medical Group
The doctors of Inova Medical Group are Inova’s premier primary care and specialty physicians,
offering top-notch medical expertise, full access to Inova facilities, and the convenience of
integrated electronic medical records.
Specialty: Pulmonary Disease, Internal Medicine, Critical Care Medicine
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Clinical Interests: Lung Cancer, Lung Problems and Treatment, Minimally Invasive Surgery
Years of Experience: 14
Areas of special interest identified by the physician or additional training completed.
Hassan A. Tetteh, MD
A member of Inova Medical Group
The doctors of Inova Medical Group are Inova’s premier primary care and specialty physicians,
offering top-notch medical expertise, full access to Inova facilities, and the convenience of
integrated electronic medical records.
Specialty: Clinical Informatics, Thoracic and Cardiac Surgery, Surgery
Years of Experience: 22
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Kathleen R. Petro, MD
A member of Inova Medical Group
The doctors of Inova Medical Group are Inova’s premier primary care and specialty physicians,
offering top-notch medical expertise, full access to Inova facilities, and the convenience of
integrated electronic medical records.
Specialty: Thoracic and Cardiac Surgery
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Clinical Interests: Adult Heart Surgery
Years of Experience: 27
Areas of special interest identified by the physician or additional training completed.
Marcelo G. Cardarelli, MD
A member of Inova Medical Group
The doctors of Inova Medical Group are Inova’s premier primary care and specialty physicians,
offering top-notch medical expertise, full access to Inova facilities, and the convenience of
integrated electronic medical records.
Clinical Interests: Children's Heart, Children's Heart Surgery
Years of Experience: 39
Areas of special interest identified by the physician or additional training completed.