Growing up in Escondido, California, Kiner was influenced by art rock bands like Yes and Pink Floyd as well as the jazz and blues greats, and he played guitar in several bands. He was a pre-med student at UCLA when he decided to follow his passion for music professionally and secured a post as musical director for a touring vocal group. While on the road, he learned to arrange for big bands and string sections on the job.
Kiner got his first work in Hollywood when a friend passed along a tape for TV show that needed a theme. That led to episodic work and composer credits on TV specials and made-for-TV movies. His first position as main composer on a series was the syndicated Superboy (1988-1992). It was soon followed by the series Super Force (1990-1992) and Land of the Lost (1991-1992).
Kiner scored his first three films in 1993: the cult hit Leprechaun, the straight-to-video Kiss and Be Killed, and the sci-fi comedy Freaked. He continued to find steady work throughout the '90s, including on Black Scorpion (1995), Black Scorpion II: Aftershock (1996), and the Bermuda Triangle-inspired sci-fi show The Visitor. He was nominated for his first Daytime Emmy Award in 1997, for The Real Adventures of Johnny Quest (Outstanding Music Direction and Composition). By the late '90s, Kiner was juggling several more series, among them Stargate SG-1 and dozens of episodes of Walker, Texas Ranger. Featuring an original theme by David Arnold, the Kiner-scored Wing Commander appeared in theaters in 1999.
The 2000s brought work on children's fare like Harold and the Purple Crayon (2001-2002) and 2003's Stuart Little (his second Daytime Emmy nomination, this time with Van Dyke Parks) as well as science fiction programs such as The Invisible Man (2000-2002) and Tremors (2003). He boosted his profile that year with a position alongside Jeff Cardoni as composer on the hit CBS series CSI: Miami (2003-2012), where he remained for all ten seasons. In the meantime, he was brought into the music department of Star Trek: Enterprise midway through its run, in 2004.
The composer made his debut in the Star Wars Universe in October 2008 with the premiere of the popular animated series Star Wars: The Clone Wars. He both wrote the theme music and scored the show over the course of its seven seasons, garnering two more Daytime Emmy nominations in 2013 and 2015. During that time, he entered the video-game sector with 2010's GoldenEye 007 and 2012's 007 Legends. His first Primetime Emmy nomination followed in 2018 in the category of Outstanding Music Composition for a Series (Original Dramatic Score) for a return to the Star Wars franchise with Star Wars Rebels (2014-2018). That series overlapped with his time on Transformers: Robots in Disguise (2014-2017), Jane the Virgin (2014-2018), and Making a Murderer (2015-2018), among other shows. After working with composer Clint Mansell on the HBO Max superhero series Titans (2018-2019) and Doom Patrol (2019-2020), Kiner helped launch yet another Star Wars spin-off, Star Wars: The Bad Batch, in 2021. ~ Marcy Donelson, Rovi