Rex was exposed to jewelry work at an early age, growing up and working in his father's retail jewelry business. He began doing German Silverwork and turquoise and silver for the American Indian trade in 1968 and in 1970 expanded this by establishing Crazy Crow Trading Post.

Muzzleloading became an important part of the business and Rex has been shooting muzzleloaders and making powder horns since 1973. He is a member of the NMLRA, NRA, HCH, CLA & CAF and does a limited amount of German silver pieces and hornwork when time permits.