Our Team

Our team of physicians, RNs, fellows and support staff collaborate to provide you comprehensive fertility services that meet the highest standards of excellence.


Our fertility specialists have advanced training and are board-certified in Obstetrics and Gynecology as well as Reproductive Endocrinology and Infertility.

Women's Health Nurse Practitioner Board Certified

Anna Geiger joins the practice as a board certified Women’s Health Nurse Practitioner with over ten years of nursing experience.  She completed her undergraduate and graduate studies at the University of Pennsylvania where she earned her master’s degree in women’s health with a minor in oncology.  She spent the last five years as a nurse practitioner in gynecologic medical oncology at Memorial Sloan Kettering Cancer Center in New York City.  Her specialized degrees and prior experience at one of the premier cancer centers in the nation has fostered a passion for oncofertility preservation.

“For patients encountering challenges with reproductive health, especially those with a new cancer diagnosis looking at surgical, medical or radiation therapy on the horizon, I want to be a source of support, empathy and expertise.   Each patient’s circumstance is unique, and ultimately my goal is to help empower them with an understanding of their reproductive health, honor their goals, and to give back a sense of control that often feels lost on these journeys.”

Anna will also support those patients seeking fertility preservation for non cancer related indications including elective indications and those seeking gender affirming hormone use. Furthermore, she will be a part of the team supporting our patients as they travel through their infertility, fertility and/or miscarriage journeys.

She is new to the Midwest so welcome her and don’t forget to tell her about all the cool things STL has to offer!





Everyday is full of new and exciting adventures for a couple or individual embarking on a sometimes short, sometimes long journey. How neat is it to help them navigate that the highs and lows of the process. That bond is unlike any in medicine, in my opinion. And the team of professionals that I work with provide an ideal environment for patients, bar none.


Dr. Valerie Ratts (she/her/hers) loves working to help couples have a child. She takes pride in helping to change and improve the world one small step at a time.

“I love what I do because I work within a team of very talented people including well-trained, bright doctors, dedicated nurses, talented ultrasonographers, cutting-edge laboratory technicians, and understanding staff. We all have the goal in mind to help and support our patients who need the best medical care, compassion and resources.”

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Please call 314-362-8200 for an appointment with Dr. Johnson.


Laboratory Director

Associate Professor, Ob/Gyn
Director, IVF Laboratory

Dr. Joan Riley (she/her/hers) assumed her role as IVF laboratory director at the Fertility and Reproductive Medicine Center in the Department of Obstetrics and Gynecology at Washington University in December 2015.  Previously, Dr. Riley held research positions at Genentech and in the Department of Obstetrics and Gynecology at Washington University.

“It’s inspiring and incredibly rewarding to work in a field in which science and medicine come together to help people build families. In the field of REI, little miracles happen every day and it’s an honor and a privilege to be a part of it. I can’t imagine a better way to spend my life than to help others create a family.”

-Joan Riley, PhD, HCLD


Our fellows are physicians who have completed a post-graduate residency in obstetrics and gynecology and are pursuing additional, specialized training in reproductive endocrinology and infertility. Fellowship training is essential to our commitment to developing expertise in the next generation of leaders in our field.

Caitlin Martin, MD, MS

3rd year Fellow

Caitlin (she/her/hers) is originally from Valley Cottage, NY. Her interest in OBGYN and infertility started early because she is a product of infertility treatment and was part of a high risk triplet pregnancy. She was a neurobiology & behavior major at Barnard College of Columbia University. During her time in college, she got her feet wet doing clinical research on Parkinson’s disease and basic science research on Dystonia. Always interested in education, she joined Teach for America following college graduation and taught high school science in the south Bronx for two years before moving to Atlanta, GA for medical school at Emory. She quickly realized her interest in OBGYN and did 6 months of research at the Centers for Disease Control and Prevention with the Assisted Reproductive Technology team during medical school. She stayed at Emory for OBGYN residency training where she completed research on OBGYN’s personal experience with reproductive life planning. Caitlin is excited to pursue her dream of becoming a reproductive endocrinologist at WashU. Her research interests include quality of life during IVF, lifestyle factors and ovarian reserve. During the research portion of her fellowship, she’ll be working in Dr. Santi’s lab performing translational research on changes in sperm allowing for fertilization during IVF. Caitlin loves working with the team at WashU and helping our patients to build their families.

Kelsey Anderson, MD

2nd year Fellow

Kelsey (she/her/hers) was born and raised in St. Louis, Missouri.  She left her hometown to obtain her BA at Vanderbilt University and returned to St. Louis to attend Saint Louis University School of Medicine for her medical degree.  Her Reproductive Endocrinology Away Rotation at Washington University made her fall in love with WashU and with REI – she went on to complete her OB/GYN residency at WashU and was overjoyed to be able to stay for fellowship.  Her research interests include subchorionic hemorrhage in IVF pregnancies and investigating factors which impact IVF discontinuation.  Her passion for reproductive endocrinology stems from it being an innovative, progressive and creative field unlike any other.  She enjoys working with patients to help them on their endocrinology or fertility journey, and there is no better team than WashU to share in that journey.  She has great St. Louis pride and, outside of work, she enjoys going to STL sporting events, exploring her new neighborhood University City, and listening to live music.

Emily Spurlin, MD

1st year fellow

Genetic Counselor

Marisa Andrews, MS, CGC

Clinical Genetic Counselor

Marisa’s (she/her/hers) passion for genetic counseling comes from her belief that genetic testing can improve patients’ lives and their medical care.  The field of medical genetics is continuously evolving so it is crucial to provide patients with accurate and balanced information on how genetic testing may be relevant for their individual case.  She is honored to play a role in empowering patients and supporting their decision-making through risk assessment, genetics education, and counseling.  At the end of the day, it is about making the tool of genetic testing work for the patients to achieve their goals.