David OReilly (Ireland, 1985) is an artist working in design, animation and video games. He has served as writer for the TV shows Adventure Time & South Park, and created the fictional video games in Spike Jonze’s Academy Award winning film Her.

In 2014 he released his first independent game Mountain and followed up with Everything in 2017. Everything won grand prizes at A MAZE & Ars Electronica and was featured as Game Of The Year by Wired, Polygon, AV Club, The New Yorker and others. Its trailer became the first ever interactive project to qualify for an Academy Award.