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.
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.
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.
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.
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.
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.
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.
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, 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.