[1] At the age of eighteen, he moved to the United States to attend Haverford College, where he studied English literature with a concentration in creative writing.

In 2009, Iaconis was the writer of Behind Enemy Lines: Colombia[2] for 20th Century Fox Home Entertainment, starring Joe Manganiello and Ken Anderson.

[5] The film began principal photography in October 2017, with stars Linda Cardellini, Raymond Cruz, Patricia Velasquez, Jaynee Lynne Kinchen, and Roman Christou,[6][7][8][9] and Michael Chaves directing.

[17] In January 2017, Daughtry and Iaconis sold a young adult-themed pitch, Five Feet Apart, to CBS Films, for Justin Baldoni to produce and direct.

[25] A novel based upon the screenplay, written by Rachael Lippincott with Daughtry and Iaconis, was published by Simon & Schuster on November 20, 2018,[26] became a number-one New York Times Best Seller,[27] and won the 2019 Goodreads' Choice Awards for Best Young Adult Fiction.

[29] In March 2019, Daughtry and Iaconis were hired by CBS Films to write the screenplay based on the social media sensation Esther the Wonder Pig.

[30] In June 2019, Daughtry and Iaconis signed on to pen the screenplay for Netflix's film adaptation of the children's fantasy-horror book, Nightbooks, by author J.

The movie was produced by Sam Raimi and Romel Adam of Ghost House Pictures, and Mason Novick and Michelle Knudsen of MXN Entertainment.

The story involves an apocalyptic contagion infecting the world outside an Amish teenager's (Katie) idyllic village, turning humans into monstrous predators.