Medical and Scientific Staff

Stefan Tiefenbacher, PhD

Vice President, LabCorp and Technical Director of Coagulation, Colorado Coag

Dr Tiefenbacher earned his PhD in Neuroscience from the University of Massachusetts, Amherst, Mass. He completed fellowships in Psychiatry and Pharmacology at Harvard Medical School and the University of Colorado Health Sciences Center. Dr Tiefenbacher joined the Colorado Coagulation team as Scientific Director in 2005, where he directs and oversees the scientific and technical aspects of clinical and clinical trial testing, as well as assay development and validation. Dr Tiefenbacher has more than 10 years of experience in assay validation in both the bioanalytical, as well as good clinical practice (GCP) setting.

He is an active contributor at the Clinical Laboratory Standards Institute (CLSI) and a member of several national and international societies including the International Society on Thrombosis and Haemostasis and the World Federation of Hemophilia.

André A Valcour, PhD

Vice President and Laboratory Director, Center for Esoteric Testing, LabCorp

Dr Valcour is a diplomate of the American Board of Clinical Chemistry (DABCC), a fellow of the National Academy of Biochemistry (NACB), and is certified by the New York State Department of Health as director of clinical chemistry, endocrinology, therapeutic drug monitoring, clinical toxicology, and serologic oncology. He earned a PhD in biochemistry from the University of Vermont and completed postdoctoral fellowship training in clinical chemistry at Hartford Hospital in Connecticut.  Dr. Valcour recently earned an MBA from Elon University.

Dr Valcour serves as either the national discipline director or co-discipline director of the following LabCorp programs: endocrinology, serologic and tumor markers, allergy, and hemostasis and thrombosis.

Dr Valcour is a member of the American Association for Clinical Chemistry.

Brian Poirier, MD

Medical Director of Coagulation, Colorado Coagulation

Dr Poirier is a diplomate of the American Board of Pathology in anatomic and clinical pathology as well as in transfusion medicine.  He earned his medical degree from the University of Colorado Health Science Center in Denver, where he received the dean's recognition for academic excellence.  Dr Poirier has completed residencies in anatomic and clinical pathology at the University of California at Davis in addition to fellowships in surgical pathology and transfusion medicine.  He has worked with the nonprofit organization, Global Healing, and the Republic of Georgia's National Center for Disease Control on a plan to improve the safety of Georgia's national blood service.  He also provided a series of advanced transfusion medicine training programs at various medical centers throughout the Republic of Georgia.

Dr Poirier holds membership in the American Society for Clinical Pathology (ASCP), the College of American Pathologists (CAP), the AABB (American Association of Blood Banks), the American Society for Apheresis, and the American Society of Hematology.