Top Infertility Specialists
Proven to be the best fertility care professionals in Delaware.

Here at Reproductive Associates of Delaware, the concept of personal care means much more. It has a tremendous impact on the results we’re able to achieve for you. Our personal and diligent approach focuses the energy of our entire team on your comfort and well-being as we help you grow your family.
Drs. McGuirk, Feinberg, Kovalevsky, and Neithardt develop custom treatment plans based on each patient’s unique situation – one that offers you the best hope for having the baby you want, in the safest, most appropriate way
Ronald F. Feinberg, MD, PhD
Medical Director, IVF Program
A mind for science. A heart for families.
Welcome to Reproductive Associates of Delaware. I look forward to talking with you personally, but in the meantime, let me share a bit of my history with you.
With a lifelong interest in the sciences, I was drawn to reproductive medicine primarily because of the research it involves. But the human side of infertility—the personal, real-life side—soon won my heart as I began to work with more and more couples in their quest to have the families they wanted.
I’m a husband and a father, and my family means everything to me. So to be able to help you grow your family—in the safe, responsible and personal way I believe in—is incredibly fulfilling for me. My partnership with Dr. McGuirk makes it even more so. We share a philosophy of care that I know benefits every family we work with.
For over two decades, I’ve had the privilege to work directly with the academic medical community (including many years at Penn and Yale) as well as national patient advocate groups such as RESOLVE, the American infertility Association, the PCOS Association and PCOStrategies. I’ve had the unique opportunity to work with a major publisher to bring to light a vital aspect of women’s health and fertility throughout the world. Dedicated to the many women who visit our office every day, Healing Syndrome O: A Strategic Guide to Fertility, Polycystic Ovaries, and Insulin Imbalance was published in 2004.
- Board Certified: Reproductive Endocrinology/Infertility and Obstetrics and Gynecology, by the American Board of Obstetrics and Gynecology
- Fellow: American College of Obstetricians and Gynecologists
- Fellowship: Reproductive Endocrinology and Infertility, University of Pennsylvania Medical Center, Philadelphia, PA
- Internship & Residency: Obstetrics and Gynecology, Yale-New Haven Hospital, New Haven, CT
- MD: University of Pennsylvania, Philadelphia, PA
- PhD: (awarded concomitantly with MD) Biochemistry, University of Pennsylvania, Philadelphia, PA
- BA: (magna cum laude) Biology, LaSalle College, Philadelphia, PA
- Attending Staff Physician: Department of Obstetrics and Gynecology, Christiana Care Health System, Newark, DE
- Associate Professor (Adjunct): Department of Obstetrics and Gynecology, Yale University School of Medicine
- Author: Healing Syndrome O: A Strategic Guide to Fertility, Polycystic Ovaries, and Insulin Imbalance (Avert Penguin Publishing)
George Kovalevsky, MD
Medical Director, Academic Affairs
Thoughtful and scientifically sound care with a personalized touch.
Choosing a medical specialty is one of the most important decisions any doctor makes. I decided to become a reproductive endocrinologist because of the amazing results I could help achieve for my patients. The greatest reward of my work has been the ability to form a bond with my patients and to guide them through successful treatment pathways. Success in my specialty means helping patients conceive and deliver a healthy baby using treatments that are best-suited for their individual situation. I cannot imagine a more rewarding profession. Fortunately, due to continuous and exciting scientific advances which have been implemented at Reproductive Associates of Delaware, I can share in the exuberant joy of success with the majority of my patients.
Having had the privilege of training and working in some of the world’s leading centers for women’s health, I have the knowledge, skills and experience needed to offer my patients the best care possible. Upon completion of my fellowship at the University of Pennsylvania, I spent three years on the clinical and research faculty at the world-renowned Jones Institute in Norfolk, Virginia, where the first successful in vitro fertilization (IVF) baby in the United States was conceived.
I am excited to work with you, under the auspices of Reproductive Associates of Delaware, in a pleasant, respectful, ethical, and caring environment. This practice provides consistently outstanding success rates that are amongst the best in the nation, with an approach matching my philosophy for thoughtful and scientifically sound clinical medicine.
I look forward to seeing you in my office, so that I can help you understand the exciting options in the world of top-notch fertility care, and assist you along the road toward a safe and successful pregnancy.
- Board Certified: American Board of Obstetrics and Gynecology
- Board Eligible: Reproductive Endocrinology/Infertility and Obstetrics and Gynecology
- Fellowship: Reproductive Endocrinology and Infertility, University of Pennsylvania, Philadelphia, PA
- Residency: Obstetrics and Gynecology, Ohio State University, Columbus, OH
- MD: University of Rochester School of Medicine, Rochester, NY. Elected to Alpha Omega Alpha Honor Society.
- Masters program: Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia, PA
- BA: Brown University, Providence, RI
- Attending Staff Physician: Department of Obstetrics and Gynecology, Christiana Care Health System, Newark, DE
- Academic Affairs: Principal Investigator for multi-center clinical trials, National Institutes of Health training grants, invited lecturer
Barbara A. McGuirk, MD
Medical Director, Reproductive Surgery
A mind for science. A heart for families.
I’d like to welcome you and take this opportunity to tell you about myself and Reproductive Associates of Delaware. I’ve been dedicated to women’s health since earning my medical degree nearly 15 years ago. My education in obstetrics and gynecology reinforced what I already knew as a mother… that the miracle of pregnancy, childbirth and parenthood really is what life’s all about. Seeing couples struggle with not being able to have children of their own, I knew I wanted to help them.
After completing my reproductive endocrinology fellowship, I could have joined any number of established practices. But I intended to provide a very specific kind of fertility care. To give the kind of care I believe in, I knew I had to create a special place and a special team. I founded Reproductive Associates of Delaware and was soon joined by my partner, Dr. Feinberg. We’ve helped grow thousands of families since that time and have maintained our shared commitment to the patients we serve.
Our approach to reproductive medicine centers on you. Your specific health needs and goals for your family guide your treatment here. Whether your personal solution is a hormone or drug therapy, a minimally invasive surgery to resolve your fertility issue or a more advanced option like IVF, you’ll get the care that’s right for you. Throughout your time with us, you’ll be respected, involved in your care and treated the way we’d like to be treated if we were in your situation.
Helping you have the family you want, while providing a wonderful experience for you, one you can look back on with fondness… I can’t imagine a more fulfilling way to offer my expertise in this fascinating area of medicine. It’s my greatest reward.
- Board-Certified: Reproductive Endocrinology/Infertility and Obstetrics and Gynecology, by the American Board of Obstetrics and Gynecology
- Fellow: American College of Obstetricians and Gynecologists
- Fellowship: Reproductive Endocrinology, University of Pennsylvania Medical Center, Philadelphia, PA
- Internship & Residency: Family Practice/Internal Medicine, Medical Center of Delaware
- MD: St. Georges University School of Medicine, St. Georges, Grenada
- BS: Biology, Pennsylvania State University, University Park, PA
- Attending Staff Physician: Department of Obstetrics and Gynecology, Christiana Care Health System
Dr. Adrienne B. Neithardt
Medical Director, Donor and Third Party Services
A mind for science. A heart for families.
I am very proud to be a member of the team at Reproductive Associates of Delaware (RAD). Drs. McGuirk, Feinberg and Kovalevsky share the same commitments I make to my patients, that is, to find the underlying cause of their infertility and to provide them with the best outcome possible. I believe we achieve this goal at RAD by combining state of the art surgical and reproductive technologies with compassion and care.
As a young medical student I was awed the first time I witnessed the birth of a baby and intrigued by the nuances behind reproductive science. I therefore decided to dedicate my career to women’s health. As I struggled to start a family of my own, I realized that I wanted to help others on their own journeys to start a family. There has been nothing more rewarding than watching the joy people have when their dream to expand their family is close to realization.
As a board certified Reproductive Endocrinologist and Infertility (REI) specialist, I have had opportunities to participate in multiple facets of research, and have enjoyed years of working in private practice. This specialty has provided me the opportunity to work in all areas of male and female infertility and reproductive endocrinology. My experience allows me to help women with ovulatory disorders such as premature ovarian failure and polycystic ovarian syndrome, as well as to successfully perform In Vitro Fertilization (IVF), and minimally invasive surgery when necessary. As the Director of Donor and Third Party Services at RAD, I have a special interest in helping patients who wish to build their families utilizing donor eggs, sperm or embryos or using a Gestational Carrier.
I look forward to meeting you and helping your dream of having a family become a reality.
- Board Certified: Reproductive Endocrinology/Infertility and Obstetrics and Gynecology, by the American Board of Obstetrics and Gynecology.
- Fellow: American College of Obstetrics and Gynecology
- REI Fellowship: National Institutes of Health, NICHD, RBMB, Bethesda, MD
- Gynecology Surgery Fellowship: Northwestern Memorial Hospital, Northwestern University, Chicago, IL
- Residency: Obstetrics and Gynecology, McGaw Medical Center of Northwestern University, Prentice Women’s Hospital and Maternity Center Chicago, IL
- MD: (Cum Laude), Georgetown University School of Medicine, Washington, DC
- BS: (Cum Laude), Biology, Binghamton University, Binghamton, NY
Melissa Aiken, PA-C
As a physician assistant with Reproductive Associates, I enhance your care by working closely with your physicians and nurse practitioners. I am actively involved with many important phases of your initial evaluation, office consultations, testing, and treatment plan. My goals are to provide you with personal support and superior clinical care, along with thorough explanations of each step. You should feel comfortable and confident as you move forward, and know that I am here to help you.
The aspects of my work that I enjoy most are being able to educate my patients, and to provide well-deserved compassion and support. I find this really helps patients who start out viewing fertility care as a bit overwhelming and emotionally-charged. I hope to make your experience with our practice as pleasant and fruitful as possible, and look forward to being by your side as you take vital steps forward in growing your family.
- MS: Physician Assistant Studies, Arcadia University, Glenside, PA
- Certified: Physician Assistant–National Commission on Certification of Physician Assistants
- BS: Biology, State University of New York at Geneseo, NY
- Member: American Society for Reproductive Medicine, American Academy of Physician Assistants, Association of Physician Assistants in Obstetrics & Gynecology
Nancy Lorber, MSN, CRNP
Fertility Care Coordinator
I perform many of the fertility-related health services you may need during your care with Reproductive Associates of Delaware, but it’s personal support and communication that I feel you’ll most appreciate. From the first time we meet, I will do everything I can to put you at ease so that you can relax and feel comfortable and confident with me and with the care you receive.
You’ll get all the time, attention and education you need to truly understand your health situation. I’ll explain in detail any treatments recommended by Drs. Feinberg and McGuirk, I’ll help you set realistic expectations and will make sure you have answers to all your questions… We never want you to feel confused or uncomfortable with your care. I’m committed to supporting you completely – with excellent clinical care and compassion – as you take this important step toward your family’s future.
- MS: Nursing, University of Pennsylvania, Philadelphia
- BS: Nursing, Thomas Jefferson University, Philadelphia, PA
- BA: Religion, Temple University, Philadelphia, PA
- Certified: Women’s Healthcare Nurse Practitioner – The National Certification Corporation for the Obstetric, Gynecologic & Neonatal Nursing Specialties
- Member: American Society for Reproductive Medicine, New Jersey Society of Reproductive Nurses
Marc Portmann
Practice Administrator and Director of Lab Innovation
Technology & expertise to help your family grow.
Even though I am frequently a behind-the-scenes IVF team member, I am directly involved in the care of every patient as embryologist and lab administrator. I thrive on the challenge and complexity of my work, but I never forget the end results of what I do every day… help people grow their families. I have a direct role in the outcome of treatment, especially when it comes to IVF. I nurture and select healthy embryos and I keep you informed about the status of each one, always in a way that lets you know how much I care about you and your results. For me, there’s nothing more rewarding than seeing families come back to visit us with their new babies and knowing I helped make their dream come tru
- MS: Health Administration, Widener University, Chester, PA
- BS: Medical Technology (Biology minor), University of Delaware, Newark
- Member: American Society for Reproductive Medicine, American Association of Bioanalysts, American Society of Clinical Pathologists, Delaware Valley Reproductive Biologists
Rhonda Wright, PA-C
I have devoted many years of my professional career to women’s health, particularly in the field of obstetrics and gynecology. During that time I witnessed firsthand the joy of families giving birth to healthy babies, along with the frustrations of others who were challenged with fertility problems. As a natural extension of my desire to help families grow, I was thrilled to join Reproductive Associates of Delaware to focus entirely on fertility care.
I value the opportunity to consult with you and to help educate you about fertility care options. Along with the rest of the clinical team, I hope to play a key role in putting you at ease, being readily available for questions, and making your experience at Reproductive Associates as comfortable and compassionate as possible. Be comforted in knowing that you are working with a team of dedicated fertility care professionals who are passionate about making your dream come true.
- Post Graduate Residency: Obstetrics and Gynecology, Montefoire Medical Center, North Central Bronx Hospital, Bronx, NY, Yeshiva University Albert Einstein College of Medicine, Bronx, NY
- BS: Alderson-Broaddus College, Philippi, WV
- Certified: Physician Assistant–National Commission on Certification of Physician Assistants
- Member: American Society for Reproductive Medicine, Association of Physician Assistants in Obstetrics and Gynecology, American Academy of Physician Assistants, Maryland Academy of Physician Assistants, Delaware Academy of Physician Assistants
Michael Tucker, PhD
IVF Scientific Director
Having worked with Dr. Feinberg, Dr. McGuirk and the rest of the team for five years now, and having known the key members of the team as friends even longer, my work here has been especially fulfilling. I am always aware of the very personal nature of my involvement with the laboratory and thereby the couples who invest so much hope in the outcome of what we do here. Working with Marc and the rest of the team is a very straightforward and honest relationship, one that is fostered by our constant communication, whether by telephone or over pizza in the office. Reproductive Associates of Delaware’s success for their patients is very important to me on many levels, not the least of which is to serve as a exquisite example of how personable, efficient and thoughtful fertility care can be. It is indeed a privilege to be associated with them as I am.
- Board-Certified: High-Complexity Clinical Laboratory Director (HCLD) Certified by the American Board of BioAnalysis (ABBA)
- PhD: University of Birmingham, UK
- BS: Zoology/Physiology, Bedford College, University of London, UK
- Member: American Society for Reproductive Medicine, European Society of Human Reproduction & Embryology, Developmental Biology Society, Society for the Study of Reproduction