The writing duo will continue their longstanding relationship with the Marvel Cinematic Universe after writing the script for next year's Captain America: Civil War (which just began production today). The two also penned Captain America: The Winter Soldier. Not coincidentally, all four projects were and are in conjunction with directors Joe and Anthony Russo. In addition to the Russo efforts, the two also created Marvel's Agent Carter and co-wrote Thor: The Dark World.
"Chris and Steve have been an integral part of the Marvel family since the early days of Phase 1, and their work speaks for itself," Marvel Studios head Kevin Feige said. "We couldn't be more excited to have them with us to help guide the Avengers through their biggest story yet."
Avengers: Infinity War Part 1 hits theaters on May 4th, 2018, while Part 2 lands on May 3, 2019.