Some rather damning evidence has been brought forwards regarding Andrew Wakefeild, the Doctor that performed the studies that suggested a link between vaccination and childhood autism.

His research is what spurred on people like Jenny McCarthy and many others to join the anti-vaccination movement.

Ten of his co-authors have repudiated his work and there are apparently a number of ethics violations involved as well.

Strangely he also had a financial interest in a MMR Vaccine in development

More info over here

Vaccine-Autism Doctor Guilty of ?Dishonesty and Misleading Conduct? : Discovery News