 By 1704 his apprenticeship was complete, and on May 13, 1706, he married Elizabeth Kilby.Samuel Sewall's diary records that in 1707 Cowell's shop was burgled "and a considerable quantity of Plate stolen," although the stolen silver was returned after the thief was apprehended.Seward later records, in 1715, that he hired a horse from Cowell, which is consistent with the profession of "innkeeper" recorded at Cowell's death.