My Grand Son Who Is Now In Sixth Grade, Has

My grand son who is now in sixth grade, has a problem focusing on a particular subject/question. His attention to what he is asked is almost not there. He has problems at school focusing on a story he reads and he almost cannot tell what the story is about. The parents are now aware of the problem which they were trying to justify in various ways for eleven years. Who are the specialists they could take him to? They live in Ft Collins, Col.
Thank you very much.