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Valerie Lynn Baker, MD MPP
- Director, Division of Reproductive Endocrinology and Infertility
- Professor of Gynecology and Obstetrics
Expertise: Reproductive Endocrinology and Infertility, Gynecology
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Katie E. Cameron, MD MBE
- Assistant Professor of Gynecology and Obstetrics
Expertise: Gender Affirming Care, Gynecology, Reproductive Endocrinology and Infertility
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Kamaria C. Cayton Vaught, MD
- Assistant Professor of Gynecology and Obstetrics
Expertise: Reproductive Endocrinology and Infertility, Gynecology
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Endrika Leon Hinton, MD
- Assistant Professor of Gynecology and Obstetrics
Expertise: Gynecology, Reproductive Endocrinology and Infertility
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Pardis Hosseinzadeh, MD MSC
- Assistant Professor of Gynecology and Obstetrics
Expertise: Gynecology, Reproductive Endocrinology and Infertility
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Ziad Rafic Hubayter, MD MPH
- Assistant Professor of Gynecology and Obstetrics
Expertise: Gynecology, Reproductive Endocrinology and Infertility
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Vasiliki Moragianni, MD MSC
- Medical Director, Fertility Center
- Assistant Professor of Gynecology and Obstetrics
Expertise: Reproductive Endocrinology and Infertility, Gynecology
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James Segars, MD
- Director, Division of Reproductive Science and Women’s Health Research
- Professor of Gynecology and Obstetrics
Expertise: Reproductive Endocrinology and Infertility, Gynecology
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Howard A. Zacur, MD
- Professor of Gynecology and Obstetrics
Expertise: Gynecology, Reproductive Endocrinology and Infertility
Our Team
Our team of physicians, embryologists and nurses are all subspecialty-trained and leaders in the field of reproductive endocrinology.
On this page:

The Johns Hopkins Standard of Care
At Johns Hopkins, our patients receive the highest level of care. Our experts receive additional training and undergo examinations to stay knowledgeable of the latest standards and innovation in gynecology and obstetrics. When you receive care at Johns Hopkins, you are in the hands of board-certified health care leaders who are recognized by the American Board of Obstetrics & Gynecology for their exceptional training.
Reproductive Endocrinologists
Bronwyn Bedrick, M.D.

Abigail Combs, M.D.

Janelle Jackman, M.D.

Anita Madison, M.D.

Kathryn Schmiech, M.D.

Julie Luterzo, NP
REI Nurse Practitioner

Dana Aybout, NP
Nurse Practitioner

IVF Nurses
- Stephanie Bianco, MSN
- Natasha Calleri, BSN, RN-OB
- Jennifer Chavis, BSN
- Jennifer Costello, MSN, Third Party Reproduction Coordinator and Assistant Nurse Manager
- Megan Mallory, BSN, RNC
- Shannon Sumner, MSN
- Sharron Whitehead, BSN
- Monicka Williams, BSN
- Carlene Yearwood, DNP, MSN, Nurse Manager
Laboratory Director
Mark Paul David Dow, PhD

- REI Laboratory Director: Johns Hopkins Fertility Center
- Assistant Professor of Gynecology and Obstetrics
Andrology/Endocrine/Embryology Team
- Kathleen Broman, B.S.
- Sarah Janney, B.S.
- Samantha Keller, B.S.
- Abigail Mangilog, B.S.
- Cassidy Morrison, B.S.
- Raunjae Payne, B.S.
- Jossiemar Perez Horta, B.S., M.S.
- Carolina Petrella, B.S.
- Kayla Silva, B.S.
- Sian Simeone, B.S., M.S.
- Meaghan Yates, B.S.
Financial Counselors
- Lisa Hartwig
- Kirsten Perry
- Sakiya Walker
- Jameira Warwick
- Makeda Williams
Support Staff
- Melony Heck, Administrative & Surgical Coordinator
- Jennifer Lake, Administrative & Surgical Coordinator
Multidisciplinary Care Partners
We are proud to collaborate with our partners throughout Hopkins to bring our patients the best possible care and address the root cause of underlying fertility issues. All of our patients can expect their fertility specialist to be at the head of their care, with access to additional care options from the following specialty areas as needed.
Urologists
Amin Herati, MD

- Director of Male Infertility and Men’s Health
- Assistant Professor of Urology
Expertise: Urology
Michal Secker, FNP-C
Michal Secker FNP-C is a Nurse Practitioner at the James Buchanan Brady Urological Institute and works at the Johns Hopkins Hospital as well as the Greenspring Outpatient Center. She works collaboratively with Dr. Amin S. Herati, MD, the Director of Men's Health and Director of Male Infertility.
