Duffield was born on November 5, 1985,[3][4] the son of Brenda and Brian Duffield. He has two sisters and spent the first nine years of his life in Harrisburg, Pennsylvania.[5][6] In 1995, he moved with his family to rural Ireland when his parents decided to become evangelical missionaries.[5][7][8] He later described the surroundings of the area in which they settled as being completely remote and lacking in popular culture.[5] He attended school in County Kildare, where he also made extra money helping farmers deliver lambs; in one classroom, three separate grades were being taught by one teacher, which he described as "very Little House on the Prairie-esque".[5] He moved back to the U.S. upon graduating from high school in 2004.[5]
Duffield graduated from both Temple University and Messiah College in 2008.[8][9] After graduation, he moved to Universal City, California for a summer internship through Temple University at the Oakwoods apartments prior to the 2007–08 Writers Guild of America strike and at the beginning of the Great Recession.[9][10] From there, he worked various jobs before becoming a professional screenwriter. His first job in Los Angeles was at the now defunct Storyopolis, a children's book store/art gallery, in Studio City, where he worked with writer Blake Harris.[9] He has also worked as an assistant and script reader within the film industry for several years.[7] Prior to selling his first spec screenplay, Duffield was a temporary employee at the Lucky Brand Jeans factory in nearby Vernon, California.[11]
Career
Duffield's first spec sale was for Your Bridesmaid is a Bitch to Skydance Media.[1] The story is partially based on his personal experience with his friends' weddings and a slew of failed relationships.[7] His friend from college had sent a copy to a contact at Circle of Confusion management company, who later offered to be Duffield's manager.[1][7][12] Several days later, they got a meeting with Skydance, who bought the script.[1][7]Eli Craig was last attached to direct and rewrite the film in May 2015.[13] Black List Live!, a live monthly stage reading of scripts featured on the Black List, did a performance of Your Bridesmaid is a Bitch in 2014.[14]