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Our Team

Our team of physicians, embryologists and nurses are all subspecialty-trained and leaders in the field of reproductive endocrinology.

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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

Nurse Practitioner

Stefanie Nelson Tyler, DNP, WHNP-BC

Headshot of Stefanie Nelson Tyler

Reproductive Endocrinology and Infertility Fellows

  • Megan Gornet, M.D.

    Megan Gornet, M.D.
  • Lucy Chen, M.D.

    Lucy Chen Headshot
  • Susan Nasab, M.D.

    Headshot of Dr. Susan Nasab
  • Lauren Reschke, M.D.

    Lauren Reschke Headshot


IVF Nurses

  • Stephanie Bianco, BSN, RN
  • Kristy A. Cosme, BSN, RN-OB, C-EFM
  • Jennifer Costello, MSN, RN, Third Party Reproduction Coordinator
  • Sandra Grem BSN, RN
  • Karen Lynch, BSN, RN
  • Sarah O'Neill, MSN, RN, Nurse Manager
  • Monicka Williams, BSN, RN

Laboratory Director

Mark P. D. Dow, Ph.D., HCLD

Mark P. D. Dow, Ph.D., HCLD


  • Kathleen Broman, B.S.
  • Samantha Keller, B.S.
  • Kimberly Thrift, B.S., CLS (CG)
  • Sian Simeone, B.S., M.S.


  • Melissa Bartness, M.S.
  • Carolina Petrella, B.S.

Financial Counselors

  • Lisa Hartwig
  • Kristen Larkin
  • Makeda Williams

Support Staff

  • Melony Heck, Administrative & Surgical Coordinator
  • Jennifer Lake, Administrative & Surgical Coordinator
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