sentences:  Aynsworth was succeeded by John Thwaites, who was head of the firm from 1780 to 1816, and master of the Clockmakers' Company in 1815, 1819, and 1820.In 1816, Thwaites partnered with George Jeremiah Reed, and the firm became Thwaites & Reed.John Thwaites remained at the firm's head until 1842.