In 2017 he dubbed the characters of Aviv Geffen, Eyal Golan, Yair Lapid, Static and Ehud Barak in the puppet series Country of the Dwarves.

As of 2020, he began appearing on the Israeli sketch comedy show The Jews are Coming, where he has impersonated various people such as Benjamin Netanyahu.

In 2008, he was a central cast member playing the role of Oori Shulimson in You Don't Mess with the Zohan starring Adam Sandler.

[5] He also dubbed Krusty the Clown in The Simpsons, Touya Kinomoto in Cardcaptor Sakura, Jackie Chan in Jackie Chan Adventures, Meowth in Pokémon, Leonardo in Teenage Mutant Ninja Turtles, Sonic in Sonic X, King Koopa in Super Mario Bros. Super Show!, Carlos in Transformers: Armada, Batman in Batman Beyond, Oscar the Grouch in Rechov Sumsum, Fuzzy Lumpkins in The Powerpuff Girls and others.

His other roles include Red in Stuart Little, and he also voiced Stuart Little in Stuart Little 3: Call of the Wild, replacing Gil Sassover, Crane in Kung Fu Panda, Marty in Madagascar, Jim Hawkins in Treasure Planet, Alpha in Up, Syndrome in The Incredibles, Krusty, Professor Frink, Otto and others in The Simpsons Movie, Kovu in The Lion King II: Simba's Pride, The Fish in The Cat in the Hat, Terry McGinnis in Batman Beyond: Return of the Joker, Donatello in TMNT, Duke Caboom in Toy Story 4, Bruno Madrigal in Encanto, Andy in Magic Camp, Sebastian J. Cricket in Guillermo del Toro's Pinocchio and Mario in The Super Mario Bros. Movie.

Mosseri has also performed the theme songs of some international television shows in Hebrew such as Captain N: The Game Master, Fireman Sam and The Bear's Island.