- (2009) Acted in a commercial for Brian Loncar & Associates.
- (2011) Acted in a commercial for Subway.
- (2012) Appeared in the music video for the Pantera song "Piss." Matthan gets punched in the face twice, breaks a laptop with a sledgehammer, and moshes with other Pantera fans.
- (2010) Acted in a NOW Video "Sick Day/Insanity" Industrial.
- (2010) Acted in a commercial for Texas Senate Seat
- (2013) Narrated a teaser trailer for the horror anthology German Angst (the "Alraune" segment, directed by Andreas Marschall).
- (2013) Narrated a second teaser trailer for the horror anthology German Angst (by directors Jörg Buttgereit, Andreas Marschall, and Michal Kosakowski).
- (2013) Performed stand-up comedy in Los Angeles at Hollywood Improv, The Comedy Store, Flappers, and Westwood Brewing Company. Matthan shared the stage with comics such as Damon Wayans, Keenen Ivory Wayans, Jim Norton, and Dean Delray.
- (2003 - 2004) Performed as vocalist in the metal band Sinnocence. They played in the Dallas-Fort Worth area at venues such as Hard Rock Cafe, Ridglea Theater, Galaxy Club, and Dreamworld Music Complex.
- (2013) Played the villain Michael Croon in the web series "Samantha Stone." However, this series was shelved after production due to a financial dispute caused by the show's producer.
- (2015) Acted in a spec commercial for a French toilet paper company.
- (2015) Performed in Live Thru This: Kurt Cobain Haunted Heck, a live haunted house show in Los Angeles.
- (2013) Performed in the live show 30 Actors in 60 Minutes in Los Angeles.
- (2016) Performed in the 15th Annual 50 Hour Drive-By Theatre Festival at Zombie Joe's Underground Theatre in Los Angeles.
- (2016) Performed in the immersive live experience ALONEinc. ACHELAND in Los Angeles.
- (2016) Produced, directed, and edited the teaser trailer for his upcoming feature film, Baphomet. He won the Bronze Remi Award for Best Movie Trailer at WorldFest-Houston Film Festival 2017 for this teaser trailer.
- (2016) Performed at Dark Hour Haunted House: Walpurgisnacht in Plano, TX. Matthan played the Wicker Man Peasant.
- (2016) Performed in the immersive live experience Shoshin in La Mirada, CA.
- (2016 - 2017) Performed in the immersive live experience Das Gericht in Los Angeles, CA.
- (2016 - 2017) Performed in the post-apocalyptic live experience/escape room The Bunker Experience in Pasadena, CA.
- (2016) Performed in the immersive live experience Bardo Thodol (The Tibetan Book of the Dead) at Midsummer Scream in Long Beach, CA.
- (2016) Performed in the immersive live experience The Rope at ScareLA in Pasadena, CA. Matthan also performed in the expanded version of The Rope in Los Angeles, CA in October and November 2016.
- (2016) Performed as Scareactor in Halloween Horror Nights at Universal Studios Hollywood. Matthan played a Walker in The Walking Dead Attraction.
- (2016 - 2017) Performed in Keith and Margo's Murder Mystery Dinner Theater in Los Angeles, CA and Anaheim, CA.
- (2017) Wrote a bass line for the song "Who Is Also A Fish" on Blah Kesto's instrumental rock album Celebrity Health Advice.
- (2017) Performed in the extreme live horror experience Heretic Horror House: The Cabin in Pasadena, CA and Big Bear City, CA.
- (2017) Played the villain Howard in the Super 8mm short film "Motel."
- (2017) Directed a comedic horror-themed commercial for Bibo Barmaid starring Eileen Dietz. Matthan also played the monster hands that appear in the commercial.
- (2018) Performed in the extreme live horror experience Two Ways To Die: Heretic/Hvrting at ScareLA in Los Angeles, CA.
- (2018 - 2019) Played various callers on the Deal Breakers segment of The Blaine Fowler Morning Show on the radio station 96.3 WDVD.
- (2018) Acted in the Toyota - "Safe Room" Industrial.
- (2010) Acted in the internet video Wall Street 2.0: A Cannes Film Festival Mashup for TheGuardian.com.
- (2019) Sam's Club "Blue Coat Award" Industrial.
- (2019) Played the caller Jeff From Lombard on The KQX Morning Crew show on the radio station 101 WKQX.
- (2019) Acted in an industrial for Guardian Integrated Security.
- (2019) Performed in Escape Hotel Hollywood's live interactive horror game Hide & Seek: A Silent Dead. Matthan played the WWII General in the Agent room.
- (2019) Played the boyfriend Nick in the trailer for HorrorWelt, directed by Larry Bones.
- (2019) Played the Dad Mannequin in Chris Wills' music video for "Pyro," directed by Liz Nistico.
- (2020) Played Symba's Attorney in Symba's music video for "Serve," directed by Austin McCracken.
- (2020) Played the interrogation detective in Tory Lanez's "Stupid Again" music video, directed by Christian Breslauer.
- (2020) Acted in the 7-Eleven "7Rewards App" Industrial.
- (2020) Appeared as himself in the DOWN - Quarter Century Throwndown livestream show.
- (2020) Played the Gunslinger in Six Flags Over Texas' live show HALLOWFEST in Arlington, TX.
- (2020) Played the Gunslinger in Six Flags Over Texas' HALLOWFEST promotional video and photos.
- (2020) Played the internet troll in King Von feat. Polo G's "The Code" music video, directed by DrewFilmedIt and Jon Primo.
- (2021) Directed, edited, and acted in the Tank featuring Dani Filth "Shellshock" music video. This was to promote Matthan's movie Baphomet as well as its soundtrack release by Cleopatra Records.
- (2021) Edited the Salt-N-Pepa music video "Push It (Military Dance Video)" for Cleopatra Records.
- (2021) Clips of Matthan from his movie Baphomet were used in the Witch of the Vale "The Way This Will End" music video. This was to promote the movie Baphomet as well as its soundtrack release by Cleopatra Records.
- (2021) Played various roles in Universal Studios' Jurassic World: The Exhibition in The Colony, TX. Matthan's roles included Ranger Matt, Bumpy's Handler, and Dino Expert in this interactive live experience.
- (2021) Played the lawyer and SWAT officer in Jordan Hollywood's "Pleasures" music video, directed by Austin McCracken.
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