In the 1750s, he was junior partner to Alexander Kincaid in Edinburgh; together they published influential philosophical and medical books. Donaldson's own shop became an important centre of Edinburgh society, and he was famous for lavish entertaining. By 1763 he had moved to London, becoming embroiled in a dispute between English and Scottish booksellers that ended with the establishment of limited copyright. See alsodonaldson vs becket.
From The Oxford Companion to the Book in Oxford Reference.