Dr. Ruth Koester grew up in Rockville, Maryland, and went on to earn her undergraduate degree from Cornell University in Ithaca, New York. She later moved to Raleigh for graduate school at NC State University, where she received her PhD in Genetics. While at NC State, she married Dave Koester, and together they raised two daughters who are now married to wonderful partners. Ruth and Dave are proud grandparents to a delightful three-year-old grandson who brings them tremendous joy.
Dr. Koester’s professional career reflects more than 30 years of dedication to the field of clinical laboratory science. She began as a technical director in a relationship testing lab and, in 1995, joined Labcorp, where her work soon expanded to include a variety of clinical testing areas. Boarded with the American Society for Histocompatibility and Immunogenetics, Ruth became a certified laboratory director and went on to serve as CLIA Director for Labcorp’s DNA Identification Testing Division. She retired in August of 2025, leaving behind a legacy of leadership, expertise, and integrity in the field of laboratory science.
Reflecting on her recent retirement, Ruth describes herself as “excited by the possibilities of a less scheduled life.” She looks forward to exploring her creative side, picking up watercolor painting, and spending more time with her grandson. She also remains an avid reader and enjoys traveling and gardening.
Ruth’s journey has not been without challenges that required courage. After decades of commitment to her work, she made the difficult decision to step away earlier than planned, prioritizing her family’s well-being and her own mental health. “I never imagined walking away from the position that I had worked so very hard to achieve,” she reflects. “But when I was honest with myself, early retirement was clearly the right path. Making that decision and acting on it felt courageous—even if it sometimes also felt like quitting.”
Looking back, Ruth says she would encourage her high school and college self to be more self-aware and thoughtful, and to trust her instincts. She would remind her younger self that “trying and failing is better than never trying” and that failure is often a powerful teacher.
Although she does not claim a personal mantra, Ruth is inspired by a favorite quote from poet Amanda Gorman: “There is always light. If only we’re brave enough to see it. If only we’re brave enough to be it.” This message resonates deeply with Ruth’s outlook on life and leadership.
Beyond her professional achievements, Ruth has made a lasting impact through community service. She served two six-year terms on the Women’s Resource Center Board of Directors, including two terms as board president, and has been an active member of multiple committees, including Working Women’s Wednesday, Governance, Finance, and Leading the Way. Her favorite event, however, remains the annual Herb Festival. In addition, she has served on the Twin Lakes Community Board of Directors and chaired a number of professional organization committees.
Whether leading in the laboratory, serving on community boards, or investing in her family, Dr. Ruth Koester exemplifies a life of service, resilience, and gratitude. Her journey reminds us that courage sometimes means making difficult choices, and that leadership is as much about integrity and balance as it is about achievement.
