In 1786 he was initiated into Balduin zur Linde of Leipzig, later reaching the Professor's Degree.
At the end of 1797 he was arrested with Rigas Feraios but his surrender to the Ottoman authorities was prevented because of his wife's intercession.
[6] His secret and intimate relationship with Feraios was revealed by the letter Rigas sent him from Trieste, which was signed as "Coleader of the Vienna Group".
He supported financially, earnestly and variedly, and through his relations with abroad, the issue and circulation of Feraios' revolutionary proclamation.
[7] After Otto's arrival in Greece, Theocharis served as the first consul of the Greek state in Leipzig from 1834 until 1843.