Under the supervision of the Christie family, the festival has been held annually since 1934, except in 1993, when the theatre was being rebuilt. The renovated theatre opened in 1994. Gus Christie, son of Sir George Christie and grandson of festival founder John Christie, became festival chairman in 2000.Since the company's inception, Glyndebourne Opera is particularly celebrated for its productions of Mozartoperas. Other notable productions included their 1980s production of George Gershwin's Porgy and Bess, directed by Trevor Nunn, and later expanded from the Glyndebourne stage and videotaped in 1993 for television, with Nunn again directing. Mozart operas have continued to be the mainstay of its repertory, but the company has expanded its repertoire with productions of Janáček and Handel operas.