John Haley is a visual effects supervisor. He studied mathematics at Vassar College, earning a Bachelor of Arts degree, and later shifted into the visual effects field.

Early in his career he worked as a technical director and in look development and lighting for films such as Zathura: A Space Adventure (2005) and Bewitched (2005). He then moved up through senior CG supervisory roles, including on The Amazing Spider-Man (2012), in which he oversaw effects sequences including Spider-Man’s swinging through New York and the climactic battle, and on Oz the Great and Powerful (2013), before progressing to more senior visual effects supervision roles. He has also been an additional visual effects supervisor on several high-profile film and streaming projects. On The Falcon and the Winter Soldier (2021) he served as Additional VFX Supervisor, part of the team nominated for a 2021 Primetime Emmy Award for Outstanding Special Visual Effects in a Season or a Movie (shared with Eric Leven, Mike May, Daniel Mellitz, Chris Waegner, Charles Tait, Sébastien Francoeur, Chris Morley, and Mark LeDoux). He has also been credited with supervisory or senior roles on productions such as Hellboy (2019) and The Boys (2019) in visual effects capacities. His work on The Falcon and the Winter Soldier was part of a larger collaboration among multiple VFX studios, including Wētā Digital, to deliver complex aerial, canyon chase, and digital environment sequences.