Doyle explains the big picture to Cooper
"You got to stop thinking about your family now, you got to think bigger than that."
Doyle is a geographer and astronaut taking part in the Endurance space exploration mission through the wormhole.
Doyle is portrayed by actor Wes Bentley.
History
While on the planet Miller, Doyle was most probably killed by a giant wave that swept him away before he could return to the ship. It may be possible that he was just unconscious and left on Miller.