Beethoven had had a connection with Diabelli for a number of years. About a slightly earlier period, 1815, Beethoven's authoritative biographer, Alexander Wheelock Thayer, writes, "Diabelli, born near Salzburg in 1781, had now been for some years one of the more prolific composers of light and pleasing music, and one of the best and most popular teachers in Vienna. He was much employed by Steiner and Co., as copyist and corrector, and in this capacity enjoyed much of Beethoven's confidence, who also heartily liked him as a man." At the time of his project for variations on a theme of his own by various composers, Diabelli had advanced to become a partner in the publishing firm of Cappi and Diabelli.