Painter, draughtsman, landscapist, portraitist, il¬lustrator, engraver. Elder brother of the draughts-man and engraver Johann Christoph Mayr. Studied in Nuremberg. Invited to St Petersburg (1778). Worked atthe Imperial Academyof Sciences, draw¬ing inventions and texts , turning sketches into finished drawings for copper engraving, correct¬ing new engravings and teaching drawing, engrav¬ing and watercolour painting. Awarded more du¬ties and students following the appointment of Princess Ekaterina Dashkova as director of the Im¬perial Academy of Sciences (1783). Painted en¬gravings made by other artists (from 1788).