Lee Steinfeld is best known for his YouTube channel, Leonhart, in which he opens Pokémon card booster packs and has a number of vintage pack openings. His channel is so popular that it boasts over 1.5 million followers. He also had an appearance on America Ninja Warrior season 11 in 2019 where contestants must pass an obstacle course with new twists, such as the Mega Wall and the Power Tower. Staying true to his brand, Steinfeld opened a Pokémon booster pack live on TV before running th course. He’s also a film and voice actor, with credits including, “One Piece: Wan pîsu,” “Basilisk: The Ouka Ninja Scrolls, “Hakyu Hoshin Engi, “Junji Ito Collection,” “Star Blazers: Space Battleship Yamato 2199,” and “The Heroic Legend of Arslan.”

Steinfeld also has a popular Instagram, like his YouTube channel, it too is under the name Leonhart which boasts over 163 thousand fans and followers. He posts interviews, commercials, and Pokémon video content. In addition to his unboxing channel, Steinfeld hosts another YouTube channel called Leonhart Plays which includes playing new videogame releases, indie hits, and Vlogs. He calls himself a real-life Pokémon master, and he’s gotta catch ‘em all! Steinfeld uses his platform for good as well, raising money for charities including charities including the Grant Halliburton Foundation on Mental Health and Suicide Prevention and the Breast Cancer Research Foundation.