Matti Klemm is a German voice actor and radio personality, born on May 27, 1975, in Leipzig. He began his career in media during his school years, working as a freelance radio presenter for the public broadcaster MDR Sputnik in 1994. After moving to Berlin in 1996, he produced music features for ARD radio stations and later hosted his own shows on stations like Radio Xanadu and Energy München. From 2001 to 2005, he was a presenter for the music television channel MTV, hosting the program MTV-Videoclash. He has also been a station voice for the youth radio station NRJ-Deutschland since 2003 and the national presenter voice for football World and European Championships on ARD and ZDF.

Klemm transitioned to voice acting in 2006, working primarily in Berlin. He has since become a prominent voice in German dubs, providing the German voice for numerous international actors, including Oscar winner Mahershala Ali, Jason Momoa, and Terry Crews. In animation, he is widely recognized for his role as the German voice of the character Jake in the long-running series Adventure Time.

Within the realm of anime and animated productions, Matti Klemm has lent his voice to a wide array of characters. He is perhaps best known for his portrayal of the iconic superhero Toshinori Yagi, also known as All Might, in the popular series My Hero Academia. He has voiced this character across the main television series, as well as in the films My Hero Academia: Two Heroes, My Hero Academia the Movie: Heroes: Rising, My Hero Academia: World Heroes' Mission, and My Hero Academia: You're Next. Another significant anime role is Thors Snorresson in the first season of Vinland Saga. He has a long-standing association with the series One Piece, where he voices the character Senghok (Sengoku), a role he has played since the character's first appearance.

His other notable anime and animated voice roles include Qasim in Cagaster of an Insect Cage, Ratzass in both Starship Troopers: Invasion and Starship Troopers: Traitor of Mars, Alexei Karamazov in The Empire of Corpses, Rockwell in Genocidal Organ, the Great-Grandfather in the film Mirai, Jason Silver in Gekijōban Kuroko no Basuke Last Game, and Mike Zacharius in Attack on Titan. He also voiced the character James Rhodes in the animated film Iron Man: Rise of Technovore. In addition to his voice work, Klemm is an active narrator for audiobooks and radio features. He is married to actress Loretta Stern and lives in Berlin.