From the passage provided, extract the names of the writers for the movie Captain America: The First Avenger. Separate them with a comma.

Captain America: The First Avenger is a 2011 American superhero film based on the Marvel Comics character Captain America. Produced by Marvel Studios and distributed by Paramount Pictures,[a] it is the fifth film in the Marvel Cinematic Universe (MCU). The film was directed by Joe Johnston, written by Christopher Markus and Stephen McFeely, and stars Chris Evans as Steve Rogers / Captain America alongside Tommy Lee Jones, Hugo Weaving, Hayley Atwell, Sebastian Stan, Dominic Cooper, Toby Jones, Neal McDonough, Derek Luke, and Stanley Tucci. During World War II, Steve Rogers, a frail man, is transformed into the super-soldier Captain America and must stop the Red Skull (Weaving) from using the Tesseract as an energy source for world domination.

Christopher Markus, Stephen McFeely