Original: The terminology of autism can be bewildering, with autism, Asperger syndrome and PDD-NOS often called the autism spectrum disorders (ASD) or sometimes the autistic disorders, whereas autism itself is often called autistic disorder, childhood autism, or infantile autism.
Simplified: His discovery is now called Asperger syndrome, while Leo Kanner's discovery is called autistic disorder, childhood autism, infantile autism, or just plain autism.