M. P. Moller
Mathias Peter Møller, commonly known as M.P. Möller or Moeller (29 September 1854 – 13 April 1937), was a Danish-American pipe organ builder and founder of the M.P. Möller Pipe Organ Company. Born on the Danish island of Bornholm, he emigrated to the United States in 1872 and founded his first workshop in Greencastle, Pennsylvania, in 1875. In 1881, civic leaders in Hagerstown, Maryland persuaded him to relocate the company to support the city's industrial growth. The firm became one of the largest pipe-organ manufacturers in the world, producing more than 12,000 instruments before going out of business in 1992.