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CalvertHealth OB/GYN Providers
Barbara K. Estes, MD
Obstetrics / Gynecology
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Hilary Ginter, MD, FACOG
Obstetrics / Gynecology
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Michelle Johnson, MD, FACOG
Obstetrics / Gynecology
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Aparajita Mahata, MD, FACOG
Obstetrics / Gynecology
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Kesha Robertson, MD
Obstetrics / Gynecology
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Deborah Davis, WHNP-BC
Nurse Practitioner
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As a woman, you fill many different roles – mother, wife, daughter, sister, friend. You take care of a lot of people. At CalvertHealth, we'll take care of you.

Our comprehensive array of women's services is specially designed to meet your needs.

GYN Oncology Center

The Gynecologic Oncology Center at CalvertHealth is a collaborative effort with Mercy Medical Center in Baltimore The center, the first of its kind in our region, offers women in Southern Maryland the opportunity to be expertly treated for cervical, endometrial and ovarian cancers close to home. Dr. Hyung Ryu, fellowship-trained in gynecologic oncology, is the medical director.

Dr. Ryu earned his medical degree at Georgetown University School of Medicine where he also completed his residency in obstetrics & gynecology. His fellowship in gynecologic oncology was completed at the University of Minnesota Hospital in Minneapolis. Dr. Ryu has extensive training in leading edge laparoscopic techniques used for the treatment of cancers of the female reproductive tract. He actively participates in research concerning evolving surgical techniques, as well as effective options for expanded chemotherapy regimens with the hope of improving outcomes for patients diagnosed with gynecologic cancers.

Dr.Ryu sees patients at CalvertHealth one day per month. Some surgeries are performed at Calvert. However, when a patient's condition requires a more complex procedure, they may be treated at Mercy. In that case, their pre-op and follow-up care can still be done at CalvertHealth.

The Gynecologic Oncology Center is located in Suite 112 of the Calvert Medical Office Building in Prince Frederick (next to the hospital). For more information or to make an appointment, call 410-535-8272.


CalvertHealth is now offering urogynecologic care locally. Dr. Jeffrey Welgoss is a board-certified obstetrician who is fellowship trained in urogynecology. He specializes in the latest minimally invasive procedures for pelvic floor disorders. Since 1998, he has been with Mid-Atlantic Pelvic Surgery Associates in Virginia. His advanced training allows him to offer the most up-to-date treatment options for conditions that affect a woman's bladder, uterus and bowels including incontinence and prolapse. Dr. Welgoss is seeing patients two days a month at CalvertHealth. His office is located in Suite 203 of the Calvert Medical Office Building. For more information, call 410-414-2775.

My story. My doctor. My Medical Center.

"I really liked how they put the mom first."

"The staff takes care of their patients with pride."

The 30-year-old dental hygienist, who lives in St. Mary's County with her husband, Shawn, said she chose to deliver both of her daughters at CalvertHealth's Family Birth Center for three main reasons - her doctor, the experienced nursing staff and the pediatric care provided.

"Most of my OB visits were at the Solomons Medical Center," said Gutman. "I was able to get good appointment times and rarely had to wait."

She went on to add, "Dr. Mitra (Nassiraee) is very professional but easy to talk to. You always feel like you're the center of her attention. She explains everything."

With her busy work schedule, Gutman said she and her husband opted for the birth education class offered on Saturdays. "You couldn't ask for any better instruction," she said. "I felt prepared even when I needed a C-section."

Gutman said she bought her breastfeeding supplies at Nurturing Necessities. "They were very helpful when it came to choosing the pump that would best fit my needs," she said. "I also attended the breastfeeding support group. I would definitely go more often if I could fit it in with my work schedule."

- Therese Gutman, Hollywood, MD
CalvertHealth's highly skilled nursing team keeps abreast of the latest technology and trends in obstetrics. They bring extensive experience to caring for you and your baby. On average the nurses at CalvertHealth's Family Birth Center have 21 years experience, with 17 years in obstetrics.

Additionally, our pediatric hospitalists provide round-the-clock coverage. They are immediately available for emergency deliveries and cesarean sections. We also offer high-risk pregnancy consultations with perinatologist Dr. Janyne Althaus from Johns Hopkins Hospital. She visits CalvertHealth monthly to provide outreach to high-risk expectant mothers.

CalvertHealth. Bringing the best to the region.

Emotional Support

Sometimes depression, anxiety or other emotional crises make it difficult to enjoy life. We are here to help.

In addition to our stress management programs, our Behavioral Health staff is available 24-hours a day for you and your family.

Emergency psychiatric services are available through our emergency department and we offer inpatient and partial hospitalization programs for situations requiring ongoing treatment.

If your teenager is having problems, CalvertHealth offers Southern Maryland's only adolescent psychiatric day treatment program. In addition, we can help you find a physician or counselor to meet your individual needs. Call our physician referral line at 1.888.906.8773 or search our Provider Directory.
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