Reproductive Endocrinology & Infertility

The Fellowship in Reproductive Endocrinology at Columbia University Medical Center is a three-year educational program designed to train obstetrician-gynecologists in the study and practice of Reproductive Endocrinology and Infertility. The Fellowship is approved by the American Board of Obstetrics and Gynecology, and accepts applications from Board eligible candidates who have completed an approved residency program in the United States. The fellowship is an integral part of the Department of Obstetrics and Gynecology at Columbia University’s College of Physicians and Surgeons.


The fellowship is balanced with individuals spending 50% of their time in research and 50% of their time in clinical training. The formal, didactic education of the fellows occurs during all three years of training and contributes approximately 7 hours each week to their educational program. Fellow attendance at these sessions is mandatory. Teaching Conferences provide formal instruction in the basic science and clinical aspects of reproductive endocrinology and infertility. A quarterly Distinguished Lecturer Series in Reproductive Endocrinology allows fellows and faculty to interact with leading authorities in the field from across the country.


During the first year, the fellow is assigned to the Reproductive Endocrine Clinical Service. This first year provides an extensive, supervised experience in the full range of clinical problems in Reproductive Endocrinology and Infertility.
The first 6 months are spent learning both the clinical and laboratory skills of assisted reproduction. During this time the early development of a basic science research project is undertaken, which will lead to a thesis. The second year fellow continues to participate in all conferences and structured educational activities of the Division. The second 6 months are devoted to research.
The Fellow is 100% devoted to research in the third year.




Clinical experience by our fellows is obtained in many settings. The Sloane Endocrine Clinic provides out-patient care for disorders of reproductive endocrinology and infertility to service the population of New York Presbyterian-Columbia University Medical Center. The full range of clinical disorders in our subspecialty, including menopause, infertility and reproductive endocrine, are seen by the first year fellow under the direct supervision of a full-time Division faculty. The Clinic provides long-term continuity of care for these patients and is run by the first year fellow as a “private practice”. The fellow is able to provide a thorough evaluation, offer all necessary treatment options, such as transvaginal ultrasound, surgery, ovulation induction, and IVF, and provide long-term follow-up. Residents and medical students, from both our own and other institutions, rotate on the Service. The clinical fellow functions as a supervisor and instructor of the residents and students. The fellow also rotates through the Endocrine clinics in the Departments of Medicine and Pediatrics and spends time in male infertility with our Urology colleagues.

The fellow is also an active member of the Assisted Reproductive team (ART). Day to day management of cases is reviewed with the Medical Director. The ART group also meets weekly to discuss patient management and related topics of interest. The fellow is taught the principles and techniques of ART. During the second year they actively participate in the full range of activities, from transvaginal sonography of follicular development to oocyte retrieval, under the supervision of the ART physicians. They are also familiarized with laboratory procedures and are offered opportunities to do research in the gamete laboratory. The fellow receives additional experience in transvaginal sonography by scanning all patients who are undergoing ovulation induction, both in the private Center for Women’s Reproductive Care (CWRC) office and the Sloane Endocrine Clinic.


Roger A. Lobo, MD
Professor, OB/GYN
Director of Fellowship Program

Dr. Lobo, formerly Rappleye Professor and Chair of the Department of Obstetrics and Gynecology, and Director of the Center for Reproductive Sciences, has extensive research and clinical experience in various areas of reproductive endocrinology and infertility including estrogen metabolism and menopause. Dr. Lobo has a primary interest in hyperandrogenic disorders and polycystic ovary syndrome. He frequently serves as editor for peer-review journals and has authored over 450 articles and 16 books. Dr. Lobo received his medical degree from the Georgetown University School of Medicine and completed his residency in Obstetrics and Gynecology at University of Chicago. He went on to complete a fellowship in reproductive endocrinology at the University of Southern California Medical Center.

Mark V. Sauer, MD, F.A.C.O.G.

Vice Chair, Academic Affairs
Division Director

Dr. Sauer has a major interest in assisted reproduction and methods of in vitro fertilization as well as hormonal influences on ovulation and oocyte donation. His other interests include HIV infection and reproduction and developing embryos for stem cell research. Dr. Sauer received his medical degree from the University of Illinois School of Medicine and completed his residency in obstetrics and gynecology at the University of Illinois Hospital. He completed his fellowship in reproductive endocrinology at the University of California at Los Angeles.

(* = Full time     ** =Other)

  • *Janet Choi, MD— Assisted Reproduction and fertility preservation in patients with cancer (Oncofertility)
  • *Nataki C. Douglas, MD, PhD — Cancer therapies and fertility in patients with childhood onset SLE. Assisted reproduction for men and women infected with HIV
  • *Michel Ferin, MD, Primate Neuroendocrinology
  • *Michael M. Guarnaccia, MD — Assisted Reproduction and preimplantation genetic diagnosis
  • *Jan Kitajewski, PhD — Wnt Gene Expression, Angiogenesis in reproduction
  • *Roger A. Lobo, MD — Reproductive Endocrinology, Hyperandrogenism, PCOS, Menopause, Cardiovascular Risk Factors
  • *Rachel McConnell, MD — Assisted Reproduction, leiomyomas and fertility
  • *Sharon Oberfield, MD — Pediatric Endocrinology
  • *Beth Rackow, MD — Renal and Mullerian anomalies in pediatric and adolescent patients; Cancer therapies and fertility in pediatric and adolescent patients.
  • *Briana Rudick, MD — Assisted reproduction for gay and lesbian individuals; Oncofertility;Oocyte donation for treatment of infertility
  • *Mark V. Sauer, MD — Assisted Reproduction; Oocyte and Embryo Donation; HIV and Reproduction; stem cell therapies
  • **Peter J. Stahl, MD — Urologist, male infertility
  • *Melvin H. Thornton, MD — Assisted Reproduction; Donor Oocytes; Pelvic Adhesion Prevention; Pelvic Surgery
  • *Sharon Wardlaw, MD — Medical Endocrinology; CRH and Endogenous Opioids and the Reproductive System
  • *Ralf C. Zimmermann, MD — Psychoneuroendocrinology; Ovarian Pathophysiology; Wnt Gene Expression

Financial Package

  • Post graduate Year 5/6 salary, including health benefits
  • Funding to attend educational and professional conferences
  • Potential funding for basic and clinical research projects

Application Process

Deadline for receiving applications is July 1. We are using the Electronic Fellowship Application System, and only the REI common application is accepted. In addition to the completed application, the following are also required:

  • Three letters of recommendation from Professors, teachers or physicians with whom you have trained or worked
  • A personal statement
  • A head and shoulders photo (not computerized) is requested but not required.

NOTE: Columbia University does not accept H1B visas.

Submission Address:

Roger A. Lobo, M.D. Director, REI Fellowship Program
Columbia University Medical Center
622 West 168th St., 16th Floor
New York, NY 10032