Dr. Paul Offit, chief of infectious disease and director of the Vaccine Education Center at the Children's Hospital of Philadelphia, is seen in this undated photograph. When the letters and e-mails started to pour in, Dr. Paul Offit braced himself. The pediatrician and vaccine inventor is a prominent defender of childhood vaccines, tackling those who have argued that immunizations can cause autism. Reuters Pictures logo Reuters Pictures 39 months ago

Dr. Paul Offit, chief of infectious disease and director of the Vaccine Education Center at the Children's Hospital of Philadelphia, is seen in this undated photograph. When the letters and e-mails started to pour in, Dr. Paul Offit braced himself. The pediatrician and vaccine inventor is a prominent defender of childhood vaccines, tackling those who have argued that immunizations can cause autism.

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