Thank you for the suggestions. There were some good comments that I'm planning on using. I think I have my search narrowed down to Rush Neurobehavioral Center (rnbc.org). It looks like it might hit the mark. By coincidence, one of the clinical psychologists happens to be the former supervisor to the guy that did my son's neuropshych eval. I also discovered that she wrote the following article which gives me some peace of mind. If anyone is familiar with them let me know.

https://www.ctd.northwestern.edu/blog/assessing-addressing-unique-needs-gifted-children

Again, thanks for the input!

Laura