Dan,
He's an American who does a whole series of spinning reel reviews and then rates them. I'm not sure of his CV but he seems to have a strong engineering background and is also a keen fisherman. His value is that he is supposedly not connected to any of the manufacturers so he is unbiased. His views are fairly well respected.
I, personally, take his reviews with a pinch of salt because I find them heavy on the engineering and light on the fishing but I'd be in a minority.
Regards,
Trevor