I've seen him on a few NatGeo shows. Almost every animal is raised from a newborn...as in he takes them from mom almost the moment they're born. He keeps them till they're healthy and old enough and reunites with pack/pride.
He's done some amazing work, especially with Hyena conservation. I totally respect the guy, as much as I do Dave Salmoni. He's doing what he loves, what most of us wish we could do and he's making a difference.
If I had the opprotunity, I'd be right there with him.