SIU OB/GYN Faculty
Medical Staff
Ricardo Loret de Mola, MD

Ricardo Loret de Mola, MD is the Chairman of the Department of Obstetrics & Gynecology and Director of the SIU Fertility & IVF Center and specializes in female infertility. He has dedicated his life to helping couples achieve the dream of having a child and has done so with great success. In 2009, SIU's state of the art facility opened in Springfield, Illinois in hopes of helping even more couples who have trouble conceiving. Dr. Loret de Mola and his team of dedicated specialists take pride and compassion in what they do. For more information or to schedule an appointment call 217.545.2229.


Tobias Köhler, MD is the Chief of the Division of Male Infertility/Urology in the Department of Surgery. He specializes in the treatment of male infertility, erectile and sexual dysfunction, and BPH (enlarged prostate). An Assistant Professor in the Department of Surgery, Dr. Köhler also sees patients at our Fertility and IVF Center located at 751 North Rutledge in Springfield.

Marybeth Gerrity, PhD, MBA - Marybeth received her PhD in Pharmacology, Physiology and Reproductive Biology from New York Medical College. She has an extensive background in Embryology, Clinical in Vitro Fertilization, Endocrinology, Andrology, and Cryobiology. She is a certified High Complexity Clinical Laboratory Director, and brings over 31 years of clinical laboratory experience to SIU.

James Kontio, BA is the embryology laboratory supervisor and senior embryologist at SIU. Previously, he was IVF laboratory director for Fertility Unlimited Ohio and served as IVF manager and technical director of the in vitro fertilization service at Akron City Hospital. James received graduate training in reproductive physiology at Michigan State University and earned his bachelor's degree at Adrian College in 1983. He has been with SIU since 2008.


Sara Zellers, RN is a Registered Nurse and has been in the Department of Obstetrics and Gynecology at SIU since 2004. She received her Nursing Degree from Lincoln Land Community College in 2002 and has been a Certified Bone Technologist since December 2007. She has also worked at the Departments of Neurology and Orthopedics at Memorial Medical Center. She has been a member of ISCD since 2007 and ASRM since 2009.


Tara Dillard, RN Tara received her RN at Graham School of Nursing. She has been with SIU since 2013.

Patricia Fank, Psy D
Becky Termine, RN - Diabetic Educator
Heather Glessner, MS, CGC is a genetic counselor on staff with SIU School of Medicine, having joined their faculty in October of 2008. She received her Bachelor of Science degree in Genetics with a minor in Psychology from Iowa State University and earned her Master of Science degree in Genetic Counseling from the University of Minnesota. Heather has well-rounded experience in genetic counseling and currently provides prenatal, infertility, and cancer genetic counseling services. She is board certified by the American Board of Genetic Counseling and is licensed to practice in the state of Illinois.  Heather is a member of the National Society of Genetic Counselors and the Genetic Task Force of Illinois.
Holly Grider has a Bachelors Degree in Radiological Sciences with a specialization in Ultrasound from Southern Illinois University in Carbondale. She has been a registered sonographer since her graduation in 2006 and has ARDMS certifications in Abdomen and OB/GYN. Holly has been with SIU since May of 2010.
REI Lab Staff
Nathan McGee - He received his BS in Biochemistry from SIUE in 2009. He started at SIU-SOM in 2009, and transferred to REI in March 2014. He is member of AAB and the College of Reproductive Biology.
Laura Rogers, MT(ASCP), MPH - She received her Bachelors of Science in Medical Technology from Illinois State University in 1992, and her Masters of Public Health degree from University of Illinois at Springfield in 2009. She has been with SIU for over 3 years. She is a member of AAB, College of Reproductive Biology, and ASCP.
Administrative Staff
Mayjan Davis - Receptionist
Katie Ellingson - Insurance Specialist
Amy Marshall - Receptionist
Lisa Sexton - Insurance Specialist