The composer of the opera Porgy and Bess is George Gershwin (8 letters). Gershwin was an American composer and pianist who wrote popular songs, Broadway musicals, and classical works. He is widely considered one of the most important and influential American composers of the 20th century. His works include the opera Porgy and Bess, which is based on the novel by DuBose Heyward and is considered one of the most important American operas.