Ian R. Tizard, BVMS, BSc, PhD, DSc (Hons), DACVM, is a Diplomate of the American College of Veterinary Microbiologists and a University Distinguished Professor Emeritus of Immunology, Department of Veterinary Pathobiology, The Texas Veterinary Medical Center at Texas A &M University (TAMU), College Station, Texas, USA. Dr. Tizard earned his Bachelor of Veterinary Medicine and Surgery from the University of Edinburgh, Scotland, in 1965. He then completed a Bachelor of Science in Pathology and a PhD in Immunology. After completing his studies, Dr. Tizard became a Post-Doctoral Fellow at the University of Guelph, where he remained as a professor until 1982 when he moved to TAMU. Dr. Tizard wrote the first standardized textbook on Veterinary Immunology in 1977. This text, now in its 11th edition, is used worldwide, and has played a major role in establishing Immunology among the key disciplines.Dr. Jeffrey M.B. Musser is a Clinical Professor Emeritus at Texas A&M University in the Department of Veterinary Pathobiology. His research includes dairy production medicine, mastitis prevention and control, and quality milk production; pharmacokinetics in exotic and food animals and drug residue prevention; vaccine investigation; and viral diseases of sheep, goats, and birds. He earned his Doctor of Veterinary Medicine from Virginia Tech and his PhD from North Carolina State University. He teaches Biomedical Microbiology and Great Diseases at the undergraduate level and Veterinary Microbiology in the professional school. Dr. Musser has received recognition and awards for his teaching, which have included the Zoetis Distinguished Teaching Award, the Distinguished Achievement University-level Teaching Award, the Distinguished Achievement College-level Teaching Award, and the International Study Abroad Education Programs Award.