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Don L. Theis is an experienced Senior Principal Scientist currently working at Zoetis since June 2006, specializing in Veterinary Medicine Research and Development, Biologicals, and Lab Sciences. Prior to this, Don L. Theis held the position of Senior Principal Scientist at Pfizer from 2003 to 2006, where responsibilities included serving as a Project Team Leader in Pharmaceutical Sciences and as an Analytical Investigator for Research and Development. Don L. Theis began the professional journey at Pharmacia, working as a Senior Scientist from 1978 to 2003.