Economics profeessor Thomas Sowell in the last few years has taken interest in the subject of "Late Talkers" He has found that Late Talkers are often misdiagnosed with Autism. His own son suffered from this as well, and spoke very little as a child. His book also notes some famous late talkers as well, including Albert Einstein who was not known to speak until he was two years old.

Dr. Sowell has written 2 books on the subject, Late Talking Children and The Einstein Syndrome. Both are worthwhile reading.