Conrad Graf
Starting as a cabinet maker, Graf became a student to a piano maker Jakob Schelkle in 1800. After the death of his teacher, Graf married his widow and took over the workshop. In 1826 he converted a former dance hall in Vienna into a piano factory. Graf's factory produced more than 3000 pianos. Graf sold the firm to Carl Stein (a grandson of Johann Andreas Stein) in 1824.