“William Theisen, recently ousted as artistic director of the Skylight Opera Theatre, has agreed to return to direct ‘The Barber of Seville,’ ‘The Marriage of Figaro’ and ‘Forever Plaid'” as well as one other show there next season. “Theisen said his decision to direct for the company in no way endorses his firing, carried out by the executive committee of the board of directors and managing director Eric Dillner.”