premise: Multiple people were involved in the development of Team Fortress 2.
hypothesis: Grant Goodeve ( born July 6 , 1952 ) is an American actor and television host . Team Fortress 2 ( TF2 ) is a team-based multiplayer first-person shooter video game developed and published by Valve Corporation . The development is led by John Cook and Robin Walker , creators of the original Team Fortress . Announced in 1998 , the game once had more realistic , militaristic visuals and gameplay , but this changed over the protracted nine-year development .