Mark Fletcher, MD, is Senior Director, Emerging Markets Medical Affairs, Pfizer Biopharmaceuticals Group, where he serves as the Scientific Expert -- Respiratory Vaccines (Pneumococcal Adult, RSV Older Adult) and Tick-Borne Diseases (Lyme Disease) / Enteric Vaccines (C. difficile). He earned his Bachelor of Science, Chemistry (With Highest Honor) and his Doctor of Medicine degree, followed by research posts in government and in academia, and he brings nearly 30 years of vaccines industry experience in medical and scientific affairs. He is the author of more than 45 peer-reviewed articles and reviews on vaccines and vaccination.