Jason Marnocha is an American voice actor known for his work in anime dubbing, animation, and web series. He was born on March 9, 1989, in Lafayette, Indiana. His interest in performance began in childhood, where he would entertain others with impressions of characters from film and television. This early passion led him to study radio at Columbia College Chicago, where he earned a Bachelor of Arts degree. During this time, he received mentorship from professional voiceover instructors, which helped him refine his skills and prepare for a career in voice acting.

Marnocha's career began to take shape online in 2006 when he started posting self-produced content and experimenting with character voices on YouTube under the handle LordJazor. These early uploads showcased his talent and helped him build recognition within online animation communities. By 2010, he had transitioned into professional voice acting, balancing freelance projects with his growing online presence. This period included collaborations with popular online creators, lending his voice to characters in Rooster Teeth's Death Battle, where he portrayed The Joker, Deathstroke, and Lobo, as well as working with TeamFourStar on Dragon Ball Z Abridged and with Bat in the Sun on their productions.

Marnocha has built an extensive portfolio of roles in English dubs of anime series. Among the many characters he has voiced are Gansaku Nanbu in Megalo Box and its sequel Megalobox 2: Nomad, the Monster King Orochi in One Punch Man, and Headmaster Hellvis in Hells. He also voiced Steven Martland in Hero Mask, Ladja in the animated film Dragon Quest: Your Story, and additional roles in series like Ikki Tousen: Western Wolves. His repertoire extends to characters such as Fire Venom Dragon in Sleepy Princess in the Demon Castle, Jirik in Gundam Build Divers Re:RISE, Balthauser in Hortensia Saga, Edward Teach in Fate/Grand Carnival, and both Miku's Father and a Former Yakuza Boss in The Way of the Househusband. He also voiced Christopher Matts, known as The Bastard, in the series Super Crooks and Gori Suido in Tokyo 24th Ward.

He is particularly recognized for his work within the Transformers franchise. He first voiced Megatron in the Prime Wars Trilogy, specifically in Transformers: Combiner Wars, Transformers: Titans Return, and Transformers: Power of the Primes. He continued in this iconic role for the Netflix series Transformers: War for Cybertron Trilogy, which included the chapters Siege, Earthrise, and Kingdom. In a notable performance, he voiced both Megatron and his future self, Galvatron, in the Earthrise and Kingdom chapters of this trilogy.

Beyond these roles, Marnocha's anime voice credits include Captain Jaguar in Edens Zero, Keicho Nijimura in JoJo's Bizarre Adventure, Carmine in the English dub of Dragon Ball Super: Super Hero, and Charlotte Oven in the English dub of One Piece Film: Red. He also provided voices for characters in series such as Cells at Work! CODE BLACK, Dr. Stone, Fire Force, and the Japanese animated series Japan Sinks: 2020.

Throughout his career, Marnocha has maintained recurring collaborations with several voice actors and dubbing studios. He has worked alongside actors like Carrie Keranen in multiple projects, including the Devil May Cry anime and My Adventures with Superman. His work frequently involves major dubbing studios such as Bang Zoom! Entertainment, Sound Cadence Studios, and Crunchyroll. His distinctive deep and resonant voice has made him a sought-after talent for voicing villains, authority figures, and rugged heroes, a quality that is consistently noted in reviews of his performances.

Looking ahead, Jason Marnocha's career continues to develop with upcoming projects. He is set to appear in the first season of The Gaslight District as Ken and in the animated series Mutant Mayhem, among other works. His consistent engagement with both traditional studio productions and online creative communities points to a versatile and ongoing presence in the field of voice acting.