Dr. Ruth Koester is a fellow of the American College of Histocompatibility and Immunogenetics (ACHI), and she is a member of American Society for Histocompatibility and Immunogenetics (ASHI), the European Federation for Immunogenetics (EFI) and the World Marrow Donor Association (WMDA). She earned a BS from Cornell University and a PhD in Genetics from North Carolina State University.

Karis Lee is an advanced practice registered nurse (APRN) specializing in rheumatology. She earned her Bachelor of Science in Nursing from the University of Florida and her Master of Science in Nursing from the University of Central Florida. Karis’ career path has included roles at Athena Medical Group, where she demonstrated her proficiency as a rheumatology nurse practitioner diagnosing and treating various rheumatologic conditions.

Dr. Cheng received her medical degree at the School of Medicine and Biomedical Sciences at University of Buffalo, followed by an internal medicine residency at Rush University Medical Center in Chicago. She then completed a fellowship in endocrinology, diabetes, and metabolism at University of California San Francisco and participated in a non-ACGME fellowship in bone and mineral disorders at Washington University in St Louis. Prior to joining Labcorp, she worked as a clinical endocrinologist at Northeast Community Clinic in Los Angeles.