I see Rick has typed him as LSI/ISTj on his site, my version is ESI/ISFj.
The impression I get of him from watching his show - somewhat reserved, tough, strict, realistic, prefers planning, values clear rules. He also has a sensitive, soft, a bit shy and childish side of him that he doesn’t like to show often, and that’s what makes me think that he might be an ESI/ISFj. One can easily mistake ISFj sensory subtype for ISTj (and vice versa). ISFjs often let their role cover the in a way that it can appear as the first function (at least for some time).