Meet the Team


  • Allergy & Immunology
  • Critical Care Medicine
  • Immediate Care
  • Interventional Pulmonology
  • Primary Care/Internal Medicine/Family Medicine
  • Pulmonary Disease
  • Sleep Medicine
  • Sports Medicine


  • Falls Church – 500 W. Annandale
  • Falls Church – 510 W. Annandale
  • Virginia Hospital Center Office
  • Immediate Care

Daniel Casey, MD

Critical Care Medicine

A native of Washington, DC, Dr. Daniel Casey joined Pulmonary and Medical Associates of Northern Virginia in 2013. Dr. Casey completed his medical education at the Georgetown University School of Medicine in 2006. He then pursued an internship and residency program in Internal Medicine and Pediatrics at Georgetown University Hospital. Finally, he completed a Critical Care and Pulmonary Disease fellowship at MedStar Georgetown University Hospital in 2013.

Ritu Cuttica, DO

Internal Medicine

“I believe in building a partnership with my patients. I enjoy getting to know each and every patient and treating them individually, which is essential to providing quality medical care.”

David R. Duhamel, MD, FCCP

Interventional Pulmonology, Pulmonary Disease, Critical Care, Internal Medicine

A native of Massachusetts, Dr. David Duhamel joined Pulmonary and Medical Associates of Northern Virginia in 1991. His clinical expertise includes Interventional Pulmonology, Pleural Diseases, and Lung Cancer.

Jeff B. Hales, MD, FCCP

Pulmonary Disease, Critical Care Medicine, Internal Medicine

“Keeping you breathing well and living a full and enjoyable life is our mission at Pulmonary and Medical Associates. Joining Privia Medical Group allows us more tools to effectively achieve that mission.”

Mary-Margaret Lewis, MD, FCCP

Critical Care Medicine

“I try to help people to live to their full potential so that they are able to enjoy the best quality of life possible, whether this is related to optimizing the quality of sleep or treating lung disease. In the critically ill, the goal is to improve the medical problems to focus on the quality of life also.”

Nancy Maaty, MD

Critical Care

“Being in the ICU can be a terrifying experience. As your doctor, my goal is to help support you and your loved ones during these difficult times, and to help you find some clarity out of the chaos.”

Timothy D. Muir, MD

Internal Medicine

Dr. Timothy Muir joined PMA Health in 2012 and has been in practice since 2000.

After graduating from the University of Michigan with a Bachelor of Science in Cellular and Molecular Biology, Dr. Muir pursued his medical education at Georgetown University, where he graduated cum laude in 1997. He then completed an internship and residency in Internal Medicine at the University of North Carolina.

Jennifer Neria, MD, MPH

Family Medicine

“As a primary care physician, I am only one part of a patient’s health team. One of my roles is to provide patient education and utilize current evidence-based medicine so that my patients can make the best choices for themselves. Together we treat illness, establish healthier lifestyles and choices, and prevent preventable diseases. To help potentiate these goals, each person in this team contributes invaluable time, effort, insight, personal strengths, and willingness to listen. I also believe in building a mutually respectful patient-doctor relationship founded on open communication and humor.”

Lawrence M. Stein, MD, FACP, FCCP

Sleep Medicine, Pulmonary Disease, Critical Care Medicine, Internal Medicine

A native New Yorker, Dr. Lawrence Stein joined Pulmonary and Medical Associates of Northern Virginia in 1991.

John P. Tabacco, MD, MPH, CAQSM

Sports Medicine, Internal Medicine

Thomas VanDruff, NP

Critical Care

“I have been active in healthcare since 1996, and currently work as an Acute Care Nurse Practitioner at the Virginia Hospital Center. I’m also an Adjunct Clinical Instructor and Course Coordinator at Georgetown University’s School of Nursing and Health Studies.”

Carren Yu Chi Wang, MD

Critical Care Medicine

Originally from South Africa, Dr. Carren Yu Chi Wang joined PMA Health in 2013.

Dr. Wang completed her undergraduate degree at Cornell University, where she graduated with a Bachelor of Arts in Biology in 2003. After she pursued her medical education at Ohio State University College of Medicine, she completed her internal medicine internship and residency at the Washington Hospital Center. Finally, Dr. Wang finished a fellowship in Pulmonary and Critical Care Medicine in 2013.

Christopher C. Wyckoff, MD

Pulmonary Disease, Critical Care Medicine, Internal Medicine

“Good medical care comes from a team approach that is patient-centered. The patient plays a very important role in their health and it is important that they have a say in the decisions that are being made. My patients are not just my patients, but part of my medical family.”

Steven M. Zimmet, MD, FACP, FCCP

Internal Medicine, Pulmonary Disease

Dr. Steven Zimmet joined Pulmonary and Medical Associates of Northern Virginia in 1974, after serving in the US Navy. He has particular clinical interests in preventive medicine and the treatment of asthma and COPD.