Electro-Harmonix is a New York-based company that makes electronic sound processors. The company was founded by Mike Matthews in 1968. They are most famous for a series of popular guitar effects pedals introduced in the 1970s and 1990s.
Partnering with an acquaintance of his, Bill Berko, an audio repairman who claimed to have his own custom circuit for a fuzz pedal, Mike Matthews and Bill jobbed construction of their new pedal to a contracting house, and began distributing the pedals under a deal with the Guild Guitar Company. Fuzzboxes were in demand following a trail of hits involving their sound, including "(I Can't Get No) Satisfaction" by The Rolling Stones two years prior, and recent popularization of Jimi Hendrix. The latter connection resulted in the pedals being branded the 'Foxey Lady'.