David Andersen, owner of David Andersen pianos in Los Angeles has been a professional musician, recording artist, and piano technician/consultant for nearly four decades. He has overseen the restoration and maintenance of hundreds of Steinway and Mason & Hamlin pianos during that time. Beginning in 1975 he apprenticed for two and a half years under Jack Cofer in Atlanta, Georgia; during the 1980s he studied at Steinway facilities both in New York and London.

Eathan has 20 years of experience as a piano technician. He studied with Dave Miller, the staff piano technician for the Mason Gross School of the Arts at Rutgers University, New Jersey. Dave Carpenter, the inventor of the Verituner electronic tuning device, provided mentorship for Eathan in Chicago. Eathan also worked with Ken Eschete and Bill Schwarts, the staff piano technicians at Northwestern University in Chicago. In 2009, he founded Floating Piano Factory of New York, a company that allows piano technicians to move from Apprentice to Craftsman level while offering value pricing to clients as technicians progress toward mastery. In 2017 he founded Piano Technicians Masterclasses, an online project designed to offer cutting-edge instruction from piano industry masters to anyone on the globe with an internet connection.