QED is a play by American playwright Peter Parnell that chronicles significant events in the life of Nobel Prize-winning physicist Richard Feynman. It presents scenes from a fictional day in Feynman's life, less than two years before his death, interweaving many strands from his biography, from the Manhattan project to the Challenger disaster inquiry to more personal topics such as the death of Feynman's wife and his own fight with cancer. The play, which grew out of a collaboration between Parnell, actor Alan Alda, and director Gordon Davidson, premiered in 2001. The original production, directed by Davidson and starring Alda as Feynman, was performed first at the Mark Taper Forum in Los Angeles and, from late 2001 to mid-2002, on Broadway.