Prest, Thomas Preskett

Thomas Peckett Prest was a British author, journalist and musician He was a prolific producer of penny dreadfuls and was known as a skilled author in the horror genre. He is now remembered as the co-creator of the fictional Sweeney Todd, the 'demon barber' immortalized in his The String of Pearls, as well as the co-author with Rymer of Varney the Vampire. He wrote under pseudonyms including Bos, a takeoff of Charles Dickens' own pen name, Boz. He also was noted to have a style similar to Dickens.

Source: Wikipedia (CC BY-SA 4.0), https://en.wikipedia.org/wiki/Thomas_Peckett_Prest