'%20d='m0%200%2016%2011h61%2061%2061%2061%2060L47%2037h61%2061%2060%2061L16%2063h61%2061%2061%2061%2060L47%2089h61%2061%2060%2061L16%20115h61%2061%2061%2061%2060L47%20141h61%2061%2060%2061L16%20166h61%2061%2061%2061%2060L47%20192h61%2061%2060%2061L16%20218h61%2061%2061%2061%2060z'/%3e%3c/svg%3e)
Leading Specialists in United States
Reproductive specialists in United States
Marcelle I. Cedars, MD
Division Director of Reproductive Endocrinology
UCSF Division Director of Reproductive Endocrinology and co-director of its IVF program. Authoritative researcher in ovarian aging and PCOS, with studies on the long-term health of children conceived through assisted reproduction.
United States 
Marcelo J. Barrionuevo, M.D.
Reproductive Endocrinologist
Marcelo J. Barrionuevo, M.D. is a board-certified Reproductive Endocrinologist at IVF Florida (Margate and Pembroke Pines), with more than 25 years of experience. Since joining in 1998, he has focused on IVF, fertility preservation, and complex female and male infertility. A past president of the Florida REI Society and 2026 Castle Connolly Top Doctor, he also serves as a volunteer clinical professor at three medical schools.
United States 
Maren Shapiro, MD
Fertility Specialist
UCSF reproductive endocrinologist focused on infertility treatment, egg and embryo freezing, PCOS and LGBTQ family building — with a training year as a global health media fellow with Stanford, the WHO and NBC News.
United States 
Mark Amols, MD
Reproductive Endocrinologist
Mark Amols is the founder and medical director of New Direction Fertility Centers and a dual board-certified reproductive endocrinologist. He trained in obstetrics and gynecology and in reproductive medicine at the Mayo Clinic and sees patients at the Gilbert, Scottsdale and Las Vegas locations.
United States 
Mark Johnson, MD
Reproductive Endocrinologist
Dr. Mark Johnson is board-certified in Obstetrics and Gynecology with subspecialty certification in Reproductive Endocrinology and Infertility, and holds a second board certification in Medical Genetics, after four years of NIH genetics research and fellowship. He has practiced reproductive medicine in Phoenix since 2000.
United States 
Melvin H. Thornton II, MD
Reproductive Endocrinologist
Dr. Melvin Thornton II is a double board-certified reproductive endocrinologist (ABOG, obstetrics and gynecology plus reproductive endocrinology and infertility) who bought and now medically directs Global Fertility & Genetics in Manhattan. He spent 15 years as medical director of Columbia's Center for Women's Reproductive Health and director of its egg donation program, and has published research on fertility treatment for HIV-positive couples.
United States 
Dr. Michael Allon, MD, FACOG
Medical Director & Reproductive Endocrinologist
Dr. Michael Allon is Medical Director of Advanced Fertility Center of Texas in Houston. He is board certified in both Obstetrics & Gynecology and Reproductive Endocrinology & Infertility, with specialized expertise in PCOS, endometriosis, and laparoscopic surgery. He serves patients in English, Spanish, Arabic, and Hebrew.
United States 
Michael D. Fox
Medical Director
Dr. Michael D. Fox is the founder and Medical Director of Jacksonville Center for Reproductive Medicine (JCRM). He holds dual ABOG board certifications in OB/GYN and Reproductive Endocrinology & Infertility. Dr. Fox pioneered the first low-cost IVF program in Northeast Florida, bringing over 30 years of experience in laparoscopic surgery, endometriosis management, and metabolic infertility care.
United States 
Dr. Michael Opsahl, MD
Medical Doctor
Dr. Michael Opsahl is the founder of POMA Fertility with 44 years of experience in women's health and infertility. He graduated from the Medical University of South Carolina, trained in the military medical system, and founded POMA Fertility in 2013 after co-founding the Northwest Center for Reproductive Sciences (NCRS). He has authored over 25 scientific papers.
United States 
Michael Strug, DO, PhD
Reproductive Endocrinologist
Michael Strug, DO PhD is a board-certified reproductive endocrinologist at Pacific Fertility Center in San Francisco who holds both a doctor of osteopathic medicine and a PhD in pharmacology and toxicology from Michigan State University, followed by an REI fellowship at Stanford. A physician-scientist with an NIH F30 research award to his name, his clinical focus is the repeat-failure patient: recurrent pregnancy loss, recurrent implantation failure, and endometrial disorders including endometriosis.
United States 
Dr. Michael Witt
Reproductive Urologist
Dr. Michael Witt is a board-certified reproductive urologist at Reproductive Biology Associates (RBA), which he joined in 1995. He practices at the Sandy Springs main office. A Fellow of the American College of Surgeons, he earned his medical degree from Oregon Health Sciences University and completed a male infertility fellowship at Baylor College of Medicine. He provides testicular microdissection, vasectomy reversal, varicocele repair and sperm retrieval surgery.
United States 
Mitchell Rosen, MD
Embryology Lab Director
Director of the UCSF Fertility Preservation Program and embryology lab director with high-complexity laboratory certification. Helps cancer patients protect fertility before aggressive treatment; teaches UCSF medical students, residents and fellows.
United States Showing 193-203 of 612
Ready to start your fertility journey?
Get a personalized plan from our medical advisors