Cynthia Besch-Williford, DVM, PhD, DACLAM
Regional Head of Pathology

Comparative veterinary pathologist Dr. Cynthia Besch‐Williford brings 30 years of experience as a rodent pathologist to her role as head of Pathology Services. With broad expertise in rodent disease pathogenesis and pathology, Dr. Besch-Williford oversees three service areas—necropsy, histology, and pathology.

Robert S. Livingston, DVM, PhD, DACLAM
Head of Molecular Diagnostics

A comparative microbiologist with more than 20 years of experience in molecular microbiology and rodent infectious disease research, Dr. Robert Livingston is in charge of the Molecular Diagnostics (PCR) Laboratory. Dr. Livingston has extensive experience in molecular diagnostic assays for detection of laboratory animal pathogens, developing PCR assays for emerging or newly recognized pathogens.

Marcus J. Crim, MBA, DVM, MS, DACLAM
Head of Microbiology and Aquatics Diagnostics

The IDEXX BioAnalytics Microbiology Laboratory is supervised by Dr. Marcus J. Crim, a veterinarian, comparative pathologist, and comparative microbiologist with specialized training in laboratory-animal medicine and pathology, rodent diseases, aquatic animal models, fish pathology, and biomedical research. Dr. Crim’s scientific interests and expertise include health monitoring for animal colonies used for research; characterizing the pathobiology of naturally occurring infectious diseases in zebrafish, rodents, and other species; and the development of rapid, sensitive, and specific diagnostic assays. Particular interests include advancing colony health monitoring by incorporating multiple diagnostic platforms and the confounding effects of spontaneous disease and host immune responses in a variety of aquatic and rodent models.