This one looks to be a Ritchey made bike that was sold by Kelly (Charlie)-Fisher (Gary) MountainBikes.  This was the group that started it all.  Ritchey built the frame and Kelly-Fisher assembled and marketed the bikes.  The Sierra used the MountainBikes frame and added a less expensive imported fork to keep the costs down.  The components used were also a step or two down from the top bikes.  Base price for the Sierra was $820.