Marryat was a tutor at dissenting academies funded by the King's Head Society. Between 1743 and 1744 he was a tutor at Stepney Academy;[2] he then taught at Plaisterer's Hall Academy.[3] At Plaisterer's Hall, he was the educator of Robert Robinson[4] and Thomas Williams.[2][5]Joseph Priestley was also sent to him, but Priestley 'resolutely opposed' the condition of subscribing every six months to 'ten printed articles of the strictest Calvinistic faith.'[6] After Zephaniah Marryat suddenly died, John Conder filled his place as theological tutor in this academy,[7] while Samuel Pike succeeded him as one of the Tuesday lecturers at Pinners' Hall.[2]