Reproductive Biology Associates: Atlanta

1100 Johnson Ferry Rd NE #200 Atlanta, GA 30342 (404) 257-1900

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Meet the Team

Andrew A. Toledo, M.D.

Andrew A. Toledo, M.D. Reproductive Endocrinologist

Andrew A. Toledo, M.D. became a member of the Reproductive Biology Associates team in 1990, and is the current CEO. He has treated infertile couples in the Atlanta area for over thirty years. His interest in the field of reproductive endocrinology and infertility began in medical school, when he had the opportunity to participate in an ongoing study of the psychological aspects of infertility. This interest flourished during his obstetrics and gynecology residency, after his work on the use of estrogen in damaged fallopian tubes was awarded first prize during Resident Research Presentations in 1980. A native of Tampa, Florida, Dr. Toledo received his medical degree in 1979 from the University of South Florida. He completed his residency in Obstetrics and Gynecology in 1983, as well as his fellowship in Reproductive Endocrinology and Infertility in 1985 at the University of Louisville. He came to Atlanta in 1985 after joining the Department of Gynecology and Obstetrics at Emory University, and was Co-director of the Reproductive Endocrinology Section at the Emory Clinic until he left to join Reproductive Biology Associates in 1990.


Dr. Toledo is board-certified in Reproductive Endocrinology and Obstetrics and Gynecology by the American Board of Obstetrics and Gynecology. He is a member of numerous medical societies, including the American Society of Reproductive Medicine (ASRM), the Society of Reproductive Endocrinologists, and the Society of Reproductive Surgeons. Dr. Toledo served as President of the Georgia Obstetrical and Gynecological Society (2003-2004) and the Atlanta Obstetrical and Gynecological Society (2005-2006). He is currently the Legislative Chair of the Georgia Obstetrical and Gynecological Society and is very active in the legislative process.


Dr. Toledo’s scientific interests span all areas of reproductive medicine, with a particular focus on advanced reproductive technologies, reproductive surgery, and recurrent pregnancy loss. He has published over forty peer-reviewed articles and has been honored in Atlanta Magazine as one of “Atlanta’s Top Docs” in 1999, 2001, 2003, 2013, 2014 and 2015. The Guide to Top Doctors named him one of the “Top Doctors in America” in 2002, 2003 and 2015, as well as one of “America’s Top Obstetricians and Gynecologists” by the Consumer Research Council of America in 2004, 2005, 2007 and 2015. He was also named one of the Best Doctors in America by his peers for 2007-2008 and included as one of the physicians in The Best of the U.S. listings in 2008 and 2015. Dr. Toledo was recently awarded RESOLVE’s 2009 Hope Award for Advocacy, based on his years of commitment to supporting access to care for infertility patients both in Georgia and throughout the U.S.

Daniel B. Shapiro, M.D.

Daniel B. Shapiro, M.D. Reproductive Endocrinologist

Daniel B. Shapiro, M.D. joined Reproductive Biology Associates in 1995. A native of Miami, Florida, he graduated Magna cum laude, Phi Beta Kappa from Bowdoin College in Brunswick, Maine. He then went on to medical school at Emory University School of Medicine in Atlanta and it was during this training that Dr. Shapiro first became interested in reproductive medicine by doing a research project with RBA in 1987.


Dr. Shapiro completed fellowship training in Reproductive Endocrinology and Infertility at the University Of Connecticut School Of Medicine in 1995. Dr. Shapiro is board-certified in both Obstetrics and Gynecology and Reproductive Endocrinology/Infertility. He is a member of the American Society for Reproductive Medicine (ASRM), the American College of Obstetrics and Gynecology (ACOG), and the Society of Reproductive Endocrinologists.


Since graduating from fellowship, he has authored and/or co-authored many scientific papers. He is an invited speaker on a number of topics in reproductive medicine and was recently faculty for a post-graduate course at ASRM. He is nationally and internationally known for his work with GnRH antagonists in IVF treatment and has consulted with other practices regarding the efficient use of these drugs. With the advances made in egg freezing by RBA’s lab, under Dr. Peter Nagy, Dr Shapiro led the effort to establish a working clinical model for RBA’s egg bank. Since the opening of the frozen egg bank for egg donation in 2007, Dr. Shapiro has acted as its clinical manager. Dr. Shapiro also serves as RBA’s medical director.

Pavna K. Brahma, M.D.

Pavna K. Brahma, M.D. Reproductive Endocrinologist

Pavna K. Brahma, M.D. joined the RBA team of physicians in 2010 after completing her fellowship in Reproductive Endocrinology and Infertility at Emory University. Dr. Brahma completed both her B.S. in Biopsychology and her medical degree at the University of Michigan. Motivated by her interest in reproductive medicine and women’s health, she then completed a four-year residency in Obstetrics and Gynecology at the University of Michigan Hospitals. Her desire to help couples achieve their dream of parenthood led her to pursue a fellowship in Reproductive Endocrinology and Infertility at Emory University. After completing her three-year fellowship at Emory, she joined RBA. Dr. Brahma’s primary clinical interest include diminished ovarian reserve, polycystic ovary syndrome, in vitro fertilization therapy, premature ovarian insufficiency, and fertility preservation. In addition, she focuses clinically on tailoring treatments and protocols based on a patient’s individual needs.


Dr. Brahma is board certified in both Reproductive Endocrinology and Infertility and Obstetrics and Gynecology by the American Board of Obstetrics and Gynecology. She specializes in all aspects of fertility care. She has published papers in multiple peer-reviewed medical journals on topics such as polycystic ovary syndrome, premature ovarian insufficiency, insulin signaling and metabolism, and uterine anomalies. She is also a contributing author to book chapters and handbooks in the field of reproductive medicine. Dr. Brahma is a member of many medical organizations, including the American Society of Reproductive Medicine, the American College of Obstetricians and Gynecologists, and the Georgia Obstetrics and Gynecology Society.


Dr. Brahma has received numerous awards for her scholastic achievements, teaching contributions, research endeavors, and most importantly, for patients care. During her residency, she was awarded the J. Robert Wilson Award for Excellence in Obstetrics and Gynecology and the Golden Apple Teaching Award. During fellowship, Dr. Brahma’s research on estrogen and the immune system earned her the Prize Paper Award and the national meeting of the American Society of Reproductive Medicine in 2009. She also won the Basic Science Research Award in 2010 at Emory University for her fellowship thesis investigating immune cell function in adipose tissue. Additionally, she has won many patient-generated awards including Patient’s Choice Award, and the Most Compassionate Physician Award.

Scott M. Slayden, M.D.

Scott M. Slayden, M.D. Reproductive Endocrinologist

Scott M. Slayden, M.D. joined RBA in January 2001. Originally a native of Coral Gables, Florida, Dr. Slayden moved to Atlanta and graduated high school from Pace Academy. He obtained a B.S. in Biology from Vanderbilt University in 1985, where he originally planned to obtain a Ph.D in marine biology and reproductive physiology. Experiences gained during his job as an undergraduate research assistant at the newly formed Vanderbilt IVF program eventually changed this plan. This one turn of events led to a true calling and career in reproductive medicine. Dr. Slayden obtained his M.D. in 1990 from Tulane University School of Medicine in New Orleans, Louisiana.


In 1994, he completed his OB/GYN residency training at the Medical University of South Carolina in Charleston. Afterwards, Dr. Slayden completed his fellowship in Reproductive Endocrinology and Infertility at the University of Alabama at Birmingham. During this time he received extensive experience with in vitro fertilization (IVF), ovulation induction, infertility surgery, and treatment of female endocrine disorders – including PCOS. Prior to joining RBA, Dr. Slayden was Assistant Professor of Obstetrics & Gynecology in the Division of Reproductive Endocrinology, Infertility and Genetics at the Medical College of Georgia, Augusta. In 2001, he decided to move beyond the university setting to join the RBA team and be closer to his extended family. He is board-certified in OB/GYN and Reproductive Endocrinology and Infertility. Dr. Slayden is a member of American College of Obstetrics and Gynecology (ACOG), the American Society of Reproductive Medicine (ASRM), and the Georgia OB/GYN Society. Dr. Slayden has over 20 years of experience in the infertility field and 10 years prior experience providing obstetrical care and delivering babies.

Robert J. Straub, M.D.

Robert J. Straub, M.D. Reproductive Endocrinologist

Robert J. Straub, M.D. joined Reproductive Biology Associates in August 2003. Though a native of New York, Dr. Straub received his B.A. from Davidson College in North Carolina. He then retuned to New York City and earned his medical degree from New York University. Following medical school, he completed a four-year residency in Obstetrics and Gynecology and was Chief Resident at Lenox Hill Hospital.


Dr. Straub was selected from over 100 applicants to complete a three-year subspecialty Fellowship in Reproductive Endocrinology and Infertility at The Center for Reproductive Medicine and Infertility at Cornell University in Manhattan under the direction of the internationally renowned, Zev Rosenwaks, M.D. During his fellowship, Dr. Straub was an Assistant Attending at The Weill Cornell Medical Center and received intense training in infertility management consisting of ovulation induction and in-vitro fertilization, management of endometriosis and polycystic ovarian syndrome, endocrine disorders, and endoscopic surgery (laparoscopy and hysteroscopy).


Dr. Straub has been published in peer reviewed medical journals on numerous occasions, on topics such as ovulation induction and ovarian apoptosis (cell death). Dr. Straub is a member of numerous medical societies, some of which are The American Board of Obstetrics and Gynecology, The American Society of Reproductive Medicine (ASRM), and The Society of Reproductive Endocrinology and Infertility.

Monica W. Best, M.D.

Monica W. Best, M.D. Reproductive Endocrinologist

Monica W. Best, MD, joined Reproductive Biology Associates in the fall of 2013 after completing her fellowship in Reproductive Endocrinology and Infertility at the Emory University School of Medicine. Dr. Best earned her undergraduate Bachelor of Science degree in Biology from the University of Michigan where she graduated with honors and with multiple academic awards to her credit. Dr. Best is a native of St. Louis and returned to Missouri for medical school where she was awarded a full academic scholarship to attend the University of Missouri School of Medicine. It was during medical school that Dr. Best became interested in research in reproductive medicine.


Dr. Best completed her residency in Obstetrics and Gynecology at the University of Chicago School of Medicine. During this time that Dr. Best realized her love of teaching residents and medical students. She was elected and served as the Chief Academic Resident of her residency class. Dr. Best went on to receive excellent training in basic reproductive endocrinology, ovulation induction, in vitro fertilization, and minimally invasive surgery during her fellowship at Emory University School of Medicine.


Dr. Best was awarded the prestigious Fulbright Scholarship where she researched and later published work on the novel rapid non-genomic actions of sex steroids at the University of Pisa in Pisa, Italy. She has published in peer reviewed journals, authored book chapters, and presented her research nationally. She is a member of numerous medical societies to include the American Congress of Obstetricians and Gynecologists and the American Society of Reproductive Medicine.

Michael A. Witt, M.D.

Michael A. Witt, M.D. Urologist

Michael A. Witt, M.D. joined Reproductive Biology Associates in 1995 and specializes in the treatment of male infertility, sexual function and urology. Dr. Witt received his medical degree from Oregon Health Sciences University in Portland, Oregon. He is a Fellow of the American College of Surgeons, a Diplomat of the American Urology Association, a member of the American Society for Reproductive Medicine (ASRM) and the American Society of Andrology.


Dr. Witt is also active in both the Georgia and Atlanta Urological Societies. He is board-certified in urology by the American Board of Urology. He completed his residency at Boston University Hospital and male infertility fellowship at Baylor College of Medicine. Prior to joining Reproductive Biology Associates, Dr. Witt was an assistant professor in the Department of Surgery at the Emory University School of Medicine.


Dr. Witt has published over twenty articles in medical journals and written numerous medical text chapters on the treatment of male infertility. He has participated in many patient education seminars and has been featured on the Learning Channel and CNN in stories relating to infertility. Atlanta Magazine has honored Dr. Witt as one of “Atlanta’s Top Docs”.

Zsolt Peter Nagy, Ph.D.

Zsolt Peter Nagy, Ph.D. Embryologist, Scientific Director

Peter Nagy, M.D., Ph.D. has served as chief embryologist at RBA since 2002. He graduated (1986) summa cum laude from Semmelweis Medical University in his native Hungary, after which he worked in several famous European IVF centers. He trained in IVF with some of the field’s earliest pioneers and most innovative thinkers. He was part of the team from Brussels University that developed the ICSI (intracytoplasmic sperm injection) insemination, a technique that has become the standard insemination method worldwide.


In 2005 Dr. Nagy and his team significantly improved oocyte cryopreservation by further developing the rapid freezing technique known as “vitrification.” Dr Nagy recognized areas in which the vitrification technology could be modified to improve egg and embryo survival. He made changes to the process and to the vitrification solutions that are necessary for the egg or embryo to survive the cryopreservation process. In 2006, he conducted a study of vitrified donor eggs at RBA. That study resulted in 15 of 20 recipients pregnant (with subsequent live birth) on the first attempt, validating the changes he had made to the vitrification technique. Of the remaining 5, 2 achieved pregnancy with frozen embryos arising from the frozen donor eggs, representing the first time that feat had ever been accomplished. The success of the pilot study lead Dr Nagy and the RBA clinical team to create MyEggBank, world’s first frozen donor egg bank.


Dr. Nagy’s work has not merely been pioneering and innovative. He has shown the necessity for nurturing not only advances in technology and medical knowledge, but in pushing for advances in the lab as well. One might say that a fertility clinic is only as good as its laboratory.

Dr Nagy has authored several hundred scientific papers and abstracts, as well books and has been ranked as No 3 Top Author of the 100 most cited publications in the world on the field of Reproductive Medicine and Science. He is meticulous, patient and precise. He cares about the people at the other end of his work and is happy to review lab outcomes with patients. His pioneering spirit and continuing work are the main reasons RBA can claim success.

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