German family of artists. Johann Lorenz Haid (b Augsburg, 1702; d Augsburg, 1750) and Johann Gottfried Haid (b Augsburg, 7 May 1714; d Vienna, 5 Sept 1776) were the sons of the Augsburg goldsmith Johann Valentin Haid (1668–1737). Johann Lorenz, a pupil of Georg Philipp Rugendas I, produced primarily engraved portraits, including 22 fantasy heads after Giovanni Battista Piazzetta, of which few have survived. Johann Gottfried studied initially with his brother, then from c. 1750 with the Viennese court painter Martin van Mytens II. During a stay in London in the first half of the 1760s he worked as a mezzotint-engraver for John Boydell, producing mezzotints after oil paintings by Rembrandt, Reynolds and Nathaniel Dance, included in the Catalogue of Plates of John and Josiah Boydell (London, 1803). He founded a school of mezzotint-engraving in Vienna in 1766, which continued after his death as a specialist school within the Kaiserliche Akademie der Bildenden Künste. He also designed numerous ornamental engravings and made reproductive prints after François de Cuvilliés I.