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Leading Specialists in United States
Reproductive specialists in United States
Alan Penzias, MD
Reproductive Endocrinologist
Dr. Alan Penzias co-founded Boston IVF in 1986 and still serves as its Regional Medical Director. Double board-certified in OB/GYN and REI, he chaired the ASRM Practice Committee for six years and has published more than 100 papers.
United States 
Alex Robles, MD
Reproductive Endocrinologist
Dr. Alex Robles, a Spanish-speaking reproductive endocrinologist trained at Weill Cornell and Columbia, pairs standard IVF and egg freezing with nutrition, lifestyle and integrative care at Columbia University Fertility Center.
United States 
Alexandra Huttler, MD
Reproductive Endocrinology and Infertility (REI) Fellow
Dr. Alexandra Huttler is a reproductive endocrinology and infertility fellow at Boston IVF, seeing patients at the Downtown Boston and South Portland, Maine centers. She trained as Chief Resident in obstetrics and gynecology at Pennsylvania Hospital and publishes on the ethics of genetic testing in IVF, ART outcomes and disparities in reproductive care.
United States 
Alexis P. Melnick, M.D.
Reproductive Endocrinologist
Alexis Melnick covers the full reproductive lifespan at Weill Cornell's CRM — ovulation induction through IVF, egg freezing, donor eggs, PGT and menopause — and cares for patients in English and Spanish, including by video visit.
United States 
Ali Guerami, M.D.
Reproductive Endocrinology & Infertility Specialist
Dr. Ali Guerami is a double board-certified reproductive endocrinologist at Fertility Specialists of Texas with more than 30 years in practice. He earned his medical degree at Tehran University Medical Center, trained at Georgetown and UT Southwestern, and is a Texas Monthly Super Doctor. Fluent in English and Farsi.
United States 
Ali J. Ainsworth, M.D.
Reproductive Endocrinologist
Dr. Ali Ainsworth directs the in vitro fertilization program for Mayo Clinic's Division of Reproductive Endocrinology and Infertility in Rochester, Minnesota. She is double board-certified by the American Board of Obstetrics and Gynecology in ob/gyn (2021) and REI (2023), with clinical focus on infertility, fertility preservation and premature ovarian insufficiency.
United States 
Alice Park
Reproductive Endocrinologist
Dr. Alice Park is a board-certified reproductive endocrinologist listed at INCINTA Fertility Center in Torrance for 2022 to 2024; she is not on the clinic's current team page. She trained at UT Southwestern, Mount Sinai and UC San Diego and focuses on PCOS, diminished ovarian reserve and fertility preservation before cancer treatment.
United States 
Alisia (Lisa) Ortiz, WHNP-BC
Women's Health Nurse Practitioner
Alisia (Lisa) Ortiz, WHNP-BC spent years as a women's health nurse practitioner in the Air Force Academy gynecology clinic before coming to CCRM. She handles the nursing side of fertility care at Lone Tree: IUIs, endometrial biopsies, cycle monitoring and the examinations that open an IVF workup.
United States 
Alison C. Peck, MD, FACOG
Reproductive Endocrinologist and Infertility Specialist
Alison C. Peck, MD, FACOG is a double board-certified reproductive endocrinologist practicing at HRC Fertility's Encino, Westlake Village and Los Angeles offices. She has treated infertility patients in Los Angeles since 2006, co-founded the group's recurrent pregnancy loss and implantation failure program, and co-authored Everything Egg Freezing.
United States 
Allison Abbey, PA-C
Physician Assistant (PA-C)
Allison Abbey, PA-C is a physician assistant — not a physician — on the Pinnacle Fertility Arizona team. She started inside the practice as a clinical assistant before earning her Master of Science in Physician Assistant Studies at A.T. Still University, and the site profiles her around patience, empathy and explaining every step. She took the network's 2025 Best-in-Class Care recognition.
United States 
Allison Komorowski, MD
Reproductive Endocrinologist
Allison Komorowski, MD joined the Northwestern Medicine fertility faculty after finishing her REI fellowship in 2024, and publishes on unequal access to assisted reproduction.
United States 
Althea O'Shaughnessy, MD, FACOG
Reproductive Endocrinologist
Reproductive endocrinologist who runs the Conceptions donor egg program, after practice at Mount Sinai, the Cooper Center for IVF and the Sher Institute.
United States Showing 13-23 of 612
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