My aunt works for a school superintendent and this is the organization they work with and have had very good results with: www.ayusa.org/
Also, while he's researching this, you son should also be looking into colleges with study abroad programs. My cousin (same aunt) spent a semester in Spain through Butler University and absolutely loved it. He had the option to go to Australia as a grad student but had the oportunity to go in to the USAF for flight training and chose that instead.
It's a very cool opportunity and if you can find a way, DO IT! I know it's scary as a parent but I wanted to do this so badly as a teen and my grandparents refused. It's something I've always regretted because then life interfered and I was 41 before I made it to Europe.
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