Mazell is believed to have been the son of Pierre Mazell (d. 2 March 1787) and Catherine Rocque (d. 7 September 1788),
Huguenots living in
Dublin,
Ireland. He lived in central London, with addresses in Tottenham Court Road (1769), Paddington (1770–80), Portland Street (1783), Gerrard Street (1790), Covent Garden (1791) and St. Pancras (1797). In 1761 he exhibited a landscape painting at the Society of Artists in London, Most of his subsequent exhibits between then and 1791 were prints of his
engravings on copperplate; these included views of country scenery such as
The Upper Lake of Killarney, 1770 as well as numerous views of London and other cities. He also illustrated some of Pennant's travel books including
Tour of Wales, 1778. As well as works by Pennant, Mazell illustrated books by
John Boydell in 1763;
Charles Cordiner's
Remarkable Ruins and Romantic Prospects of North Britain in 1792; and Captain
James Cook's
Voyages. including Charles Cordiner;
Moses Griffiths;
John Webber;
Rowland Omer;
Philip Thicknesse; the natural history artist
Desmoulins;
Samuel Rawle; Richard Holland; William Miller;
Jonathan Fisher;
Thomas Snagg;
James "Athenian" Stuart;
Christian Georg Schütz;
Paul Sandby; John Watts; the equestrian painter
George Stubbs. ==Awards and achievements==