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Medical Director, Cardiac Surgery

Alan Speir, MD

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
Areas of special interest identified by the physician or additional training completed.
Years of Experience: 48

Adult Cardiac Surgeons

Katherine Klein, MD

Katherine M Klein, 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 (Eligible), Surgical Critical Care, Surgery
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Years of Experience: 16
Kathleen Petro, MD

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
Areas of special interest identified by the physician or additional training completed.
Years of Experience: 30
Liam Ryan, MD

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
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Clinical Interests: Adult Heart Surgery
Areas of special interest identified by the physician or additional training completed.
Years of Experience: 21
Eric Sarin, MD

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
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Clinical Interests: Adult Heart Surgery
Areas of special interest identified by the physician or additional training completed.
Years of Experience: 25
Ramesh Singh, MD

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
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Clinical Interests: Adult Heart Surgery
Areas of special interest identified by the physician or additional training completed.
Years of Experience: 23
Alan Speir, MD

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
Areas of special interest identified by the physician or additional training completed.
Years of Experience: 48
Daniel Tang, MD

Daniel G Tang, 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.
Years of Experience: 24

Pediatric Cardiac Surgeons

Lucas Collazo, MD

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
Areas of special interest identified by the physician or additional training completed.
Years of Experience: 34

James D St. Louis, 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: Congenital Cardiac Surgery, Thoracic and Cardiac Surgery
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Years of Experience: 31

Advanced Practice Providers

Sandra Bobba, FNP

Sandra L Bobba, FNP

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: Family Nurse Practitioner
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Liana Chen, FNP

Liana Chen, FNP

Family Nurse Practitioner
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: Family Nurse Practitioner
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Clinical Interests: Asthma, Diet Counseling, Physicals, Preventative Disease Care
Areas of special interest identified by the physician or additional training completed.
Elizabeth Gill, PA

Elizabeth A Gill, PA

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: Physician Assistant
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Natalie Grieb, FNP

Natalie M Grieb, FNP

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: Family Nurse Practitioner
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Jamie Keith, NP

Jamie T Keith, NP

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: Nurse Practitioner
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Christie Le, FNP

Christie Le, FNP

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: Family Nurse Practitioner
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Yanbei Zhao, NP

Yanbei Zhao, NP

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: Nurse Practitioner
Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.