William JOHNSON married Catherine JERVIS on the 2nd January 1809, at St. Peter's Cathedral, Sheffield.
One of the witnesses was Catherine's sister Sarah Jervis, who married Joseph Pearson.
Catherine was born c1797 in Rawmarsh, Yorkshire. William was born c1772, possibly in Chesterfield?
I didn't find any heirs from their union; which would be why the pottery was passed onto Catherine, then Catherine's nephew James Jervis Pearson - & came the beginning of Pearsons' Potteries.