The screenplay that was made for iron man was wrote by Mark Fergus and Hawk Ostby.

Mark Fergus:
Cowboys and Aliens (2011)
Iron Man (2008)
Children of Men (2006)
First Snow (2006)
Consequence (2003)

Hawk Ostby:
Cowboys and Aliens (2011)
Iron Man (2008)
Children of Men (2006)
First Snow (2006)
Consequence (2003)

The name who directed this film is called Jon Favreau. he directed many other films such as"In Case of Emergency", Zathura: A Space Adventure, Elf, Life on Parole, "Undeclared"and many more.