High Quality Content by WIKIPEDIA articles! Frederick Mathushek (June 9, 1814 - November 9, 1891), was a piano maker working in Worms, in Rhineland, Germany and in the United States at New York City and New Haven, Connecticut during the second half of the nineteenth century. His name continued to be used by several different piano manufacturers through the 1950s, and was filed independently as a trademark for musical instruments in 2005 and 2008.