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Advisory Board


The members of Extend Fertility’s medical advisory board are world-renowned leaders and pioneers in the field of egg freezing and infertility.


Medical Advisory Board

Alan Copperman, M.D., F.A.C.O.G.

Consulting Medical Director to Extend Fertility

Reproductive Medicine Associates of New York

Dr. Alan Copperman is Director of the Division of Reproductive Endocrinology as well as the Vice-Chairman of the Department of Obstetrics, Gynecology, and Reproductive Science at Mount Sinai Medical Center in New York, and is co-director of Reproductive Medicine Associates of New York. An experienced and respected clinician, he has published numerous award-winning papers and textbook chapters on egg freezing, infertility, polycystic ovarian syndrome, and pelvic surgery. New York Magazine has listed Dr. Copperman in its Best Doctors Issue every year from 2002 to 2007. Recently, Fertile Hope selected Dr. Copperman to join their medical advisory board.

Dr. Copperman received his undergraduate degree from the University of Pennsylvania and his medical degree from New York Medical College. He completed residency in Ob/Gyn at Yale-New Haven Hospital, then continued his training at Mount Sinai Medical Center in New York as the Martin J. Clyman Fellow in Reproductive Endocrinology. Dr. Copperman is board certified in both Ob/Gyn and reproductive endocrinology.

David Diaz, MD

West Coast Fertility Center

Dr. Diaz is the founder and medical director of Frozen Egg Bank, Inc. Dr. David Diaz is also Medical Director of West Coast Fertility Center in Orange County, California. He spearheads the advancing science behind egg freezing and thawing.

Dr. David Diaz attended Loyola University School of Medicine in Chicago, Illinois and the University of Missouri where he completed his residency training. He continued his advanced training in endocrinology and infertility as a clinical fellow at Beth Israel Hospital, Harvard Medical School in Boston, Massachusetts. Dr. Diaz performed research in the development of medication protocols for IVF that led to one of the highest pregnancy rates in the nation. Diaz was appointed to the teaching staff at Harvard Medical School as Instructor in Obstetrics and Gynecology with an emphasis in Reproductive Endocrinology and Infertility.

He is a frequent guest lecturer, serves as a consulting medical expert for local and national TV and print publications, and is seated on the EMD Serono Advisory Board. Dr. Diaz is a fellow member of the American College of Obstetricians and Gynecologists and member to the American Society for Reproductive Medicine and Society for Assisted Reproductive Technologies (SART).

Joseph A. Hill III, M.D., F.A.C.O.G.

Fertility Centers of New England

Dr. Hill most recently served as Director of Reproductive Medicine at Brigham and Women’s Hospital in Boston, and as Associate Professor in Ob-Gyn and Reproductive Biology at Harvard Medical School. Dr. Hill is a world-renown speaker and expert in reproductive medicine, especially relating to recurrent pregnancy loss. He has been named as one of “The Best Doctors in America” in three national consumer publications. He has been awarded several academic scholarships; published more than 100 scientific and clinical papers and textbook chapters; and presented at many medical and scientific meetings in 22 countries. He is a member of many professional associations, including the American College of Obstetricians and Gynecologists, the American Gynecological and Obstetrical Society, the American Society for Reproductive Medicine, and the Society for Gynecologic Investigation

Dr. Hill completed his medical degree and residency at The Medical College of Georgia. He completed a fellowship in Reproductive Endocrinology and Infertility and Reproductive Immunology at Brigham and Women’s Hospital and Harvard Medical School.

Gerard S. Letterie, D.O., F.A.C.O.G.

Seattle Reproductive Medicine

Dr. Gerard Letterie is a board certified reproductive endocrinologist with over 20 years of clinical and academic experience. He is the Medical Director of the Northwest Center for Reproductive Sciences. He is an associate clinical professor in the Department of Obstetrics and Gynecology, University of Washington, Seattle and member of the American Board of Obstetrics and Gynecology as an examiner. He continues his military affiliation by serving as a consultant at Madigan Army Medical Center, Tacoma WA. Dr. Letterie was recently selected as one of the areas leading infertility practitioners by the Puget Sound Consumers Guide and is listed in Guide to America’s Top Obstetricians and Gynecologists for 2004-2005 by the Consumers Research Council of America.

William Schoolcraft, MD

Colorado Center for Reproductive Medicine

William Schoolcraft, MD is the founder and Medical Director of the Colorado Center for Reproductive Medicine. He completed his medical training at the University of Kansas and finished his residency in obstetrics and gynecology in 1983 at the UCLA School of Medicine in Los Angeles, California. In 1983 he began private practice in the field of obstetrics, gynecology and infertility in Denver. The Colorado Center for Reproductive Medicine was established in 1987 upon Dr. Schoolcraft’s completion of specialized training at UCLA in the area of infertility. Within its first five years of operation, CCRM and Dr. Schoolcraft had begun to develop a national reputation for excellence in both pregnancy and delivery rates.

Dr. Schoolcraft is an award-winning researcher and has authored countless articles on infertility. He has been voted by local physicians to 5280 Magazine’s “Top Docs” list every year since 1996. Dr. Schoolcraft is the author of “If At First You Don’t Conceive” published in 2010. This breakthrough book offers hope to prospective parents by explaining what they need to know, including: finding proven treatments for each condition, and dealing with the emotional and financial aspect of infertility.

Kaylen Silverberg, M.D., F.A.C.O.G.

Texas Fertility Center

Dr. Silverberg is the Medical Director and a founding partner of Texas Fertility Center. In addition, he is a Clinical Assistant Professor in the Division of Reproductive Endocrinology and Infertility at the University of Texas Health Science Center in San Antonio and is a Clinical Associate Professor at the University of Texas Medical Branch at Galveston. He is listed in Best Doctors in America and frequently lectures both nationally and internationally on infertility research he has conducted. He has served on the Time/Life Medical Editorial Board and the Board of Directors of the Society for Assisted Reproductive Technology (SART).

Dr. Silverberg received his undergraduate degrees in Molecular Biology and Business Administration from Vanderbilt University and his graduate degree at Baylor College of Medicine. He completed his residency in Obstetrics and Gynecology at the Vanderbilt University Medical Center and his infertility fellowship at the University of Texas Health Science Center in San Antonio.

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