As a bachelor he married Ann Saness at St Leonard, Shoreditch in 1761; both were from that parish.
He entered maker’s marks at Goldsmiths Hall in 1761 as a small worker from Princes Street, Moorfields.
As a widower he married Angela Littleboy at St Leonard, Shoreditch in 1763; both were from that parish.
Eight children of James and Angela Marson of Princes Street, Upper Moorfields were christened at that church 1763-1774.
He paid duty as a goldsmith of Moorfields for the Apprentice Indentures of Emanuel Alvaris in 1767
and, for the same reason in 1774 for John Jones, as a case maker from St Leonard, Shoreditch.
He entered another maker’s mark at Goldsmiths Hall from Princes Street in 1775 this time as a case maker.
His burial in December 1783 was recorded at St Luke, Finsbury.
His widow Angela entered her own mark in July 1784.