Where can I look for the gear John Pierson uses?

Find and submit the guitar rig, amplifier setup, effects pedalboard, and other instruments used by John Pierson.

If the artist is active on social media, check places like their Instagram feed and look for musical equipment they can be seen using.

You should also do a Google image search for things like "John Pierson studio" and "John Pierson live" and spot gear that way.