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Valerie Lynn Baker, M.D.
- Director, Division of Reproductive Endocrinology and Infertility
- Practice Director, Reproductive Endocrinology and Infertility
- TeLinde-Wallach Professor of Gynecology and Obstetrics
- Professor of Gynecology and Obstetrics
Expertise: Diminished Ovarian Reserve, Dysfunctional Uterine Bleeding, Fertility before and after Cancer Treatment, Fertility Preservation, In Vitro Fertilization
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Katherine Elizabeth Cameron, M.D.
- Assistant Professor of Gynecology and Obstetrics
Expertise: Diminished Ovarian Reserve, Fertility before and after Cancer Treatment, Fertility Preservation, Gender Affirming Care, In Vitro Fertilization
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Kamaria Cherise Cayton Vaught, M.D.
- Assistant Professor of Gynecology and Obstetrics
Expertise: Obstetrics and Gynecology
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Chantel Ianthe Cross, M.D.
- Director, Reproductive Endocrinology and Infertility Fellowships
- Director, Patient Education
- Assistant Professor of Gynecology and Obstetrics
Expertise: Endometriosis, Fertility before and after Cancer Treatment, Fertility Preservation, Fibroids, In Vitro Fertilization
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Endrika Leon Hinton, M.D.
- Assistant Professor of Gynecology and Obstetrics
Expertise: Reproductive Endocrinology and Infertility
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Pardis Hosseinzadeh, M.D., M.S.
- Assistant Professor of Gynecology and Obstetrics
Expertise: Fertility Preservation, Male Factor Infertility, Obstetrics and Gynecology, Polycystic Ovarian Syndrome (PCOS), Premature Ovarian Failure
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Ziad Rafic Hubayter, M.D., M.P.H.
Expertise: Diminished Ovarian Reserve, Fertility Preservation, In Vitro Fertilization, Obstetrics and Gynecology, Reproductive Endocrinology and Infertility
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Vasiliki A Moragianni, M.D., M.Sc.
- Assistant Professor of Gynecology and Obstetrics
Expertise: In Vitro Fertilization, Obstetrics and Gynecology, Reproductive Endocrinology and Infertility
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James Hugh Segars Jr, M.D.
- Director, Division of Reproductive Science and Women’s Health Research
- The Howard and Georgeanna Jones Professor
- Professor of Gynecology and Obstetrics
Expertise: Endometriosis, Infertility, Reproductive Endocrinology
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Howard A Zacur, M.D., Ph.D.
- Professor of Gynecology and Obstetrics
Expertise: Dysfunctional Uterine Bleeding, Gynecology and Obstetrics, Infertility, Menopause, Ovarian Dysfunction
Our Team
Our team of physicians, embryologists and nurses are all subspecialty-trained and leaders in the field of reproductive endocrinology.

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
Abigail Combs, M.D.

Megan Gornet, M.D.

Anita Madison, M.D.

Kathryn Schmiech, M.D.

Julie Luterzo, NP
REI Nurse Practitioner

Ashley Shaffer, NP
REI Nurse Practitioner

Urologists
Amin Sedaghat Herati, M.D.

- Director of Male Infertility and Men’s Health
- Assistant Professor of Urology
- Assistant Professor of Gynecology and Obstetrics
Expertise: Benign Prostatic Hyperplasia (BPH), Erectile Dysfunction, Low Testosterone, Male Infertility, Pelvic Pain
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.

IVF Nurses
- Stephanie Bianco, MSN
- Natasha Calleri, BSN, RN-OB
- Jennifer Chavis, BSN
- Jennifer Costello, MSN, Third Party Reproduction Coordinator
- Megan Mallory, BSN, RNC
- Audrey Moore, BSN
- Shannon Sumner, MSN
- Susan Taylor, BSN
- Monicka Williams, BSN
Laboratory Director
Mark Dow, Ph.D.

- REI Laboratory Director: Johns Hopkins Fertility Center
- Laboratory Director, Division of Reproductive Endocrinology and Infertility
- Assistant Professor of Gynecology and Obstetrics
Andrology/Endocrine/Embryology Team
- Kathleen Broman, B.S.
- Whitney Glenn, B.S.
- Rebecca Holton, Ph.D.
- Sarah Janney, B.S.
- Samantha Keller, 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
- Shardonnae Belin
- Lisa Hartwig
- Kirsten Perry
- Makeda Williams
Support Staff
- Melony Heck, Administrative & Surgical Coordinator
- Jennifer Lake, Administrative & Surgical Coordinator