I know this man. He was the only 'school therapist' at my son's special education 8-12 grade school. The entire time he "counseled" our kids at Orion Academy, he was isolating them, and once alone, was saying terribly inappropriate (abusive) things to them. He made strong psychological suggestions to them that attacked their fragile self-esteem. Things like "if you don't pass your final you will be homeless", "I don't believe you are being bullied, I think you made it up for attention", "you guys think you're funny, no autistic person is. You need to stop your attempt at humor". He hated the kids at that school and made it really clear by his hostility and lack of empathy. He picked on kids he didn't like (especially the LGBTQ ones). I saw him frequently acting with anger towards young impressionable teenagers, who through no fault of their own had trouble focusing. He never understood Autism Spectrum adolescents, not who these kids really are.
I would be very, very cautious taking his advice on anything that might impact a child emotionally. I am not the only parent at Orion who felt this way about him. We were glad when he left, but concerned when we heard he was writing books on our ASD kids.