In his youth Næzén was a founder member, on 13 December 1769, of the Swedish Topographical Society in Skara alongside parish priest and naturalist Clas Bjerkander, Anders Dahl, Johan Abraham, entomologist Leonard Gyllenhaal, chemist Johan Afzelius and Olof Knös. The members reported on plant and animal life, geography, topography, historical monuments and economic life, mostly in the Västergötland area.
