Arthur Krigsman is a pediatrician and gastroenterologist best known for his controversial research in which he attempted to prove that the MMR vaccine caused diseases, especially autism. He specializes in the evaluation and treatment of gastrointestinal pathology in children with autism spectrum disorders, and has written in support of the diagnosis he calls autistic enterocolitis. The original study that tied the MMR vaccine to autism and GI complaints conducted by one of Krigsman's associates has been found to be fraudulent, and the diagnosis of "autistic enterocolitis" has not been accepted by the medical community.