Gregg handcrafts snare drums, cymbals, and percussion out of a variety of metals, mainly stainless steel.
[2] His drums have been used by the likes of Elvin Jones, Matt Cameron, Dave Grohl, Jeremy Taggart, and Zach Hill.
[3] Keplinger is best known for his stainless steel drums, which are often noted for their explosive sound as well as heavy weight and shell thickness (3mm).
[4] Gregg has toured the world as a drum tech for Matt Cameron with Soundgarden and Pearl Jam, Our Lady Peace, and Sunny Day Real Estate among others.
Matt Cameron stated in the June 1994 issue of Modern Drummer magazine that "Gregg (Keplinger) was in the studio this time to help me out with things, changing heads and putting up cymbals.