DCInternists - Your Personal Private Physician

Rosalyn Stewart, MD, MS, MBA

Board Certified General Internist

Accepting New Patients

I cherish the opportunity to learn my patients’ stories, and to be allowed into their lives, something I continue to find amazing and wonderful. I am dedicated to providing exceptional care using my extensive medical training and compassionate approach, and prioritize building trusting relationships and fostering open communication.

I received my MD from the University of Texas Medical Branch School of Medicine and an MS degree in preventive medicine from the University of Texas Health Science Center at San Antonio. I’ve been a professor of clinical medicine at the Johns Hopkins University School of Medicine for more than twenty years and have held joint appointments in the Departments of Medicine and Pediatrics.

I am board certified in Internal Medicine and am a fellow of the American College of Physicians, The American Academy of Pediatrics and a member of the American Society of Addiction Medicine.

I have particular expertise in medical education, clinical program development and community outreach and advocacy.

My husband, Matthew, is an otolaryngologist and we have four adult children.

Beth Horowitz, MD

Board Certified General Internist

I received my BA from Stanford University. I am a graduate of the University of California San Francisco medical school and completed my internal medicine residency at the Mount Zion/UCSF program. I also have a masters in health and medical education from UC Berkeley. After moving back to the East Coast in 1987, I joined the faculty of George Washington University Medical Center, eventually becoming director of the medical residency program. While at GW, I developed courses and gave numerous presentations on issues related to women’s health.

I opened a private practice in 1996, but have maintained an academic appointment and have taught first and second year medical students over the years. I have worked with Peace Corps volunteers, am a Fellow of the American College of Physicians and an active member of Physicians for Human Rights. I enjoy treating patients at all stages of adulthood. I have a special interest in adolescents and often begin working with them when they first leave their pediatrician. To better understand the health problems facing people at the other end of life, I became board certified in geriatrics in the early 1990s.

I have been named a Washington magazine Top Doctor and listed in Best Doctors in America.

I live in Washington DC with my husband, Michael Kazin, who is a professor of US history at Georgetown University. We have 2 grown children and an unruly dog.

Gregory Prokopowicz, MD, MPH

Board Certified General Internist

“As a physician, my role is not just to diagnose and treat, but to help the patient understand medical concepts and to successfully navigate the medical system and coordinate their care with multiple specialists. It has never been more important to have a trustworthy interpreter of medical knowledge, and I strive to play that role through teaching and conversation with my patients.”

I received my BS in philosophy and psychology, MPH in epidemiology, and MD from the University of Michigan. I completed my residency in internal medicine at Johns Hopkins and joined the faculty, where I maintained a busy primary care practice for 25 years, taught generations of medical students and residents, and directed the Johns Hopkins Hypertension Center.

I am board certified in Internal Medicine and am a fellow of the American College of Physicians and the American Society of Hypertension. I was selected as a Top Doctor by Baltimore Magazine in 2020 and 2021.

I have particular expertise in the management of cardiovascular disease, diabetes, and obesity.

My wife, Kimberley, is also a physician, and I have two sons, Michael and Matthew. My interests include fitness, classical music, and current affairs.

Catherine Okuliar, MD

Board Certified General Internist

Accepting New Patients

My philosophy of patient care centers on educating patients and working with them to develop a personalized healthcare plan that meets their needs and incorporates best practice standards. I consider it a privilege to get to know my patients well, and I value the long-term relationships that are at the heart of high quality primary care. I also enjoy coordinating with colleagues in other fields and helping patients navigate our complex health care system.

I graduated magna cum laude from Rice University with a BA in Biology and received my MD from the University of Texas Southwestern. I completed my Internal Medicine internship at the University of California San Francisco and my residency training at Georgetown University.

I then joined the faculty at Georgetown where I had an active primary care practice for 17 years. As an associate professor, I was also engaged in teaching and research, and I held multiple leadership roles in medical student and resident education.

I am board certified in Internal Medicine and am a Fellow of the American College of Physicians. I am also a member of the Phi Beta Kappa and Alpha Omega Alpha honor societies. Over the past decade, I have been frequently acknowledged as a Top Doctor by Washingtonian Magazine.

I have particular expertise and training in preventative medicine and lifestyle coaching, as well as in the management of chronic conditions such as diabetes, thyroid disorders, and heart disease. I have experience caring for adults ranging from age 18 to 100. My mission is to help patients of any age live healthy, active lives so they can accomplish their goals.

My husband, Alex, is an attorney and we have two teenage sons and a labradoodle. My hobbies include travel, hiking, and tennis. I speak both English and Spanish.

202-293-3636

our concierge model

meet our providers

Rosalyn Stewart, MD, MS, MBA
General Internist

Beth Horowitz, MD
General Internist

Gregory Prokopowicz, MD, MPH
General Internist

Catherine Okuliar, MD
General Internist

Rosalyn Stewart, MD, MS, MBA

Board Certified General Internist

Accepting New Patients

Beth Horowitz, MD

Board Certified General Internist

Gregory Prokopowicz, MD, MPH

Board Certified General Internist

Catherine Okuliar, MD

Board Certified General Internist

Accepting New Patients

VIDEOS

DR. Rosalyn Stewart

DR. Catherine Okuliar

contact us

payment portal

202-293-3636

our concierge model

meet our providers

Rosalyn Stewart, MD, MS, MBA General Internist

Beth Horowitz, MD General Internist

Gregory Prokopowicz, MD, MPH General Internist

Catherine Okuliar, MD General Internist

Rosalyn Stewart, MD, MS, MBA

Board Certified General Internist

Accepting New Patients

Beth Horowitz, MD

Board Certified General Internist

Gregory Prokopowicz, MD, MPH

Board Certified General Internist

Catherine Okuliar, MD

Board Certified General Internist

Accepting New Patients

VIDEOS

DR. Rosalyn Stewart

DR. Catherine Okuliar

contact us

payment portal

Rosalyn Stewart, MD, MS, MBA
General Internist

Beth Horowitz, MD
General Internist

Gregory Prokopowicz, MD, MPH
General Internist

Catherine Okuliar, MD
General Internist