Our Team

Our board-certified and fellowship-trained surgeons have performed thousands of procedures, pioneering new treatment and recovery approaches with results rarely matched nationwide.

Inova Schar Heart and Vascular at Inova Fairfax Medical Campus, where we perform our cardiac surgeries, is a high volume cardiac center that consistently receives the highest ratings for quality and superior patient outcomes.

Eric L. Sarin, MD

Section Chief, Adult Cardiac Surgery
Co-Director, Structural Heart and Valve Program
Co-Director, Cardiovascular Research

Alan M. Speir, MD

Director Emeritus, Cardiac Surgery
Senior Associate Director, Inova Schar Heart and Vascular
Director, ECMO Program
Director of Quality, Outcomes, and Clinical Excellence

Adult Cardiac Surgeons

Katherine Klein, MD
Katherine Klein, MD
Specialty
Thoracic and Cardiac Surgery, Surgical Critical Care, Surgery
Years of Experience
16
Kathleen Petro, MD
Kathleen Petro, MD
Specialty
Thoracic and Cardiac Surgery
Clinical Interests
Adult Heart Surgery
Years of Experience
30
Liam Ryan, MD
Liam Ryan, MD
Specialty
Thoracic and Cardiac Surgery
Clinical Interests
Adult Heart Surgery
Years of Experience
21
Eric Sarin, MD
Eric Sarin, MD
Specialty
Thoracic and Cardiac Surgery
Clinical Interests
Adult Heart Surgery
Years of Experience
25
Ramesh Singh, MD
Ramesh Singh, MD
Specialty
Thoracic and Cardiac Surgery
Clinical Interests
Adult Heart Surgery
Years of Experience
23
Alan Speir, MD
Alan Speir, MD
Specialty
Thoracic and Cardiac Surgery
Clinical Interests
Adult Heart Surgery
Years of Experience
48
Daniel Tang, MD
Daniel Tang, MD
Specialty
Thoracic and Cardiac Surgery, Surgery
Years of Experience
24

Pediatric Cardiac Surgeons

Marcelo Cardarelli, MD
Marcelo Cardarelli, MD
Specialty
Thoracic and Cardiac Surgery
Clinical Interests
Children's Heart, Children's Heart Surgery
Years of Experience
42
Lucas Collazo, MD
Lucas Collazo, MD
Specialty
Thoracic and Cardiac Surgery, Congenital Cardiac Surgery
Clinical Interests
Children's Heart, Children's Heart Surgery
Years of Experience
34
James St. Louis, MD
James St. Louis, MD
Specialty
Congenital Cardiac Surgery, Thoracic and Cardiac Surgery
Years of Experience
31

Advanced Practice Providers

Sandra Bobba, FNP
Sandra Bobba, FNP
Specialty
Family Nurse Practitioner
Liana Chen, FNP
Liana Chen, FNP
Specialty
Family Nurse Practitioner
Clinical Interests
Asthma, Diet Counseling, Physicals, Preventative Disease Care
Elizabeth Gill, PA
Elizabeth Gill, PA
Specialty
Physician Assistant
Natalie Grieb, FNP
Natalie Grieb, FNP
Specialty
Family Nurse Practitioner
Jamie Keith, NP
Jamie Keith, NP
Specialty
Nurse Practitioner
Christie Le, FNP
Christie Le, FNP
Specialty
Family Nurse Practitioner
Yanbei Zhao, NP
Yanbei Zhao, NP
Specialty
Nurse Practitioner