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Elizabeth Hamelin serves as the Toxins and Drugs of Abuse Laboratory Chief at the Centers for Disease Control and Prevention, where responsibilities include developing analytical methods for human exposure assessment using LC/MS and GC/MS. With a career beginning as a chemist at Ambar, followed by roles at Columbian Chemicals Company, Pennzoil, and Battelle, Elizabeth has extensive experience in method development, optimization, and validation of clinical assays and analytical techniques. Educational qualifications include a Master of Science in chemistry from Texas A&M University and a Bachelor of Arts in Chemistry and Spanish from Coe College.