British History On-line credits Cusworth with the Newby Place monument.
Mapping Sculpture provides some information. The stone masons John Cusworth & Sons was active 1825-79, at least two generations. John Cusworth Senior (1795-15 November 1856) was born in Canterbury, Kent and was based in Stoke Newington from sometime in the early 1820s. His son, John Cusworth Junior was born in Hackney in 1827 and was working as a stone mason by 1851. He took over the firm at his father's death. John Cusworth Senior left effects valued at under £400. The known works associated with the firm are funerary monuments.
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