Ross Marquand is an American actor and voice actor known for his work in both live-action and animation. Born on August 22, 1981, in Fort Collins, Colorado, he received a Bachelor of Fine Arts in Theatre from the University of Colorado at Boulder before moving to Los Angeles to pursue an acting career. He gained widespread recognition for his live-action role as Aaron on the television series The Walking Dead. However, his skill for vocal impersonations has also made him a prolific voice actor in animated series, including several notable roles in the anime and animation genres.

In the field of anime voice acting, Marquand is recognized as the English dub voice of Hassel in Pokémon Horizons: The Series. Hassel is a character who serves as a mentor and an Elite Four member in the Paldea region. Beyond this role, he has contributed to other animated works that appeal to anime and animation fans. He portrayed the iconic character Han Solo in the Phineas and Ferb Star Wars special, demonstrating his ability to mimic well-known voices. He has also provided various character voices for animated series such as Conan.

Marquand has established recurring collaborations with several major animation franchises. He is a regular voice actor in the Amazon Prime Video animated series Invincible, where he voices multiple characters, including the Immortal, Rudy Connors (also known as Robot), and Aquarus. This series represents a significant portion of his animation work. He has also worked extensively with Marvel Animation, voicing characters in the Marvel Cinematic Universe animated series What If...?, where he took on the roles of Red Skull and an alternate universe version of Ultron. He continued his Marvel animation work by voicing Professor X in the series X-Men '97. Additionally, he has made guest appearances on long-running adult animated series such as Family Guy, American Dad!, and Robot Chicken, often voicing celebrity impressions or various one-time characters.

Among his notable achievements, Marquand is particularly acclaimed for his ability to perform accurate impressions of numerous celebrities, including Harrison Ford, Brad Pitt, and Matthew McConaughey. This talent has allowed him to seamlessly take over iconic roles from other actors; for instance, he succeeded Hugo Weaving as Red Skull in the Marvel Cinematic Universe films Avengers: Infinity War and Avengers: Endgame, and later voiced a version of Ultron originally portrayed by James Spader. His voice work in Invincible has been a prominent part of that show's success, and his role as Professor X in X-Men '97 places him within a beloved franchise with a dedicated anime and animation fanbase.