Aside from performing several characters used in Balls of Steel, he also auditioned talent and directed recording sessions for Apogee and 3D Realms games at Bill Reardon's RR Brand Productions studio in Dallas.

In 2016, Jackson worked with Gearbox Software to create new songs for the Duke Nukem 3D: 20th Anniversary World Tour game.

[4] A series of "Composers Play" interviews published on YouTube in December 2018 covers much of his involvement in Duke Nukem 3D, as well as some of the history behind how he got his start writing music for videogames.

Jackson created all of the tracks for the fourth episode of Duke Nukem 3D, better known as the "Plutonium PAK Add-On" or as the full four-episode "Atomic Edition".

Grabbag has elicited many spin-offs and remixes over the years by both fans and professional musicians, including an officially sanctioned studio version by the popular thrash metal outfit Megadeth.

3D Realms featured it on the front page of their website and contracted with Kline to use it to promote their Xbox Live release of Duke Nukem 3D.

Jackson was one of the first people to qualify for full voting membership in National Academy of Recording Arts and Sciences (the Grammy organization) based solely on works published with video games.

In May 2018, Jackson was elected to membership in ASCAP (the American Society of Composers, Authors, and Publishers) for publication of his album, Calibrations.

Jackson began working a radio producer and on-air traffic and news reporter out of what was the Dallas / Fort Worth market of Metro Networks in 2004.

He primarily provided traffic reports on the 9:00 p.m. to 5:00 a.m. overnight shift for 1080 KRLD (AM) in Dallas from 2006 until late 2012, when poor health forced him to go on disability status.

Jackson was one of many former 3D Realms employees who worked on the long-delayed Duke Nukem Forever and who attended the game's Happy Ending launch party held on June 11, 2011 at the Palladium Ballroom in Dallas,[20] along with his wife and son.