In 1791, Cartellieri was employed by the Polish Count Oborsky. During the Count’s travels to Vienna, Antonio had the possibility to study composition and counterpoint with Johann Albrechtsberger (1736-1809). Antonio also became a favorite of Prince Joseph Franz Maximilian Lobkowitz who was very impressed with Cartellieri's Symphony in C Minor, performed in Vienna in 1795, that he secured Cartellieri’s musical services for himself.
“Here [Vienna], on the occasion of an Academy presented by Oborsky, he made the acquaintance with that unforgettable friend of music, his Highness Prince Joseph Lobkowitz. Cartellieri conducted his extraordinary symphony in C minor, and the amazed Prince immediately asked Oborsky for my father’s musical services. Oborsky was unhappy to lose him. So, in 1796 my father became the Kapellmeister at that great patron of the arts whose court was the gathering place for artists. It was there that Cartellieri made the acquaintance of all the famous composers and virtuosi and his intellect found continuous stimulation...”
(Report of Joseph Cartellieri on the life of his father Antonio Casimir Cartellieri, 16-12-1826)