Jason Reinier is a sound designer and soundscape composer based in San Francisco. He has a long history of creating sound for theater, museums, and computer games. For many years, he was a fixture on KPFA on Sunday nights, airing environmental soundscape art and electroacoustic music.

He was an key early organizer of the Nature Sounds Society, which sponsors technical workshops and annual field recording weekends in the Sierra Nevada. For many years, he designed sound elements at Electronic Arts, with The Sims among his sonic legacies there.

Three times he has catalyzed global recording projects to document the sounds of our planet on a single day. The first, in 1996, spawned the EarthEar CD "Day of Sound" (and, by a glorious quirk of fate, took place on the day his nephew was born). The second took place on the turn of the millenium, and the third, Day-O-Sound, on January 20, 2009, the day of Barack Obama's inauguration.