If he is a taxidermist, then he will have the most use for a caping knife (a knife specifically designed to "cape" or skin a hunter's trophy. Much like a paring knife, or a bird and trout knife. 2-3 inch blade, acute point, some belly but not too much, slim handle, easy to choke up on, and easy to control. The gross skinning of the game is not generally a problem, it is skinning the ears, noses, and lips of animals that can be trouble. Remember that a taxidermist is going to be working on birds and fish as well as deer, elk, bear, moose, etc. Take a look at Knives of Alaska's Cub Bear for an example of a good caping knife.
http://www.knivesofalaska.com/
click of "Fixed Blade Knives," then on "Cub Bear."
I bought an "Alaskan Hunter" and a "Cub Bear" (both Knives of Alaska products) and had a kydex sheath made for the pair. Thought the big knife with the generous belly would be really handy skinning deer and elk. Turns out the small caping knife gets the lions share (make that all) of the skinning duty. Still really like the Alaskan Hunter, but really haven't found a use for it yet.
You don't have to spend a fortune on super steels to get good life out of a working edge. I have a knife in 420j2 (gil hibbin alaskan pro hunter) that gutted, skinned, boned out, and butchered an elk and three whitetails before needing any work on the edge.