Fathers with Large Heads and Autistic Offspring

One mother recently wrote of an intriguing connection between Autism in the child and a father with a large head on Autism Mercury:

... the geneticist ... said that the one pattern he has seen in parents of autistic children is a history of mental illness on the mother's side of the family and a large head (I'm not making this up!)/very high intelligence of the father...

The association between parental intelligence and autism was first widely publicized in a Wired magazine article, The Geek Syndrome where they reported the high incidence of Asperger's and Autism in the children of Sillicon Valley tech workers.