That Matt is a real genius figuring out these fish eat nymphs/caddis/rock worms.
The PM wiggler (nymph type fly) was around way before he got the idea to popularize nymphs. Also a guy named Teeney saw the nymph light way before Matt. All he did is pass on knowledge he has picked up from other fisherman. His book is ok, but the Linesman/Neveda book and the one by the Kuistch(SP?) bros is equally as good.