David Henderson "Dave" Fennoy is the voice actor for Pietro Polendina. He is also the voice of Doctor Merlot in the Rooster Teeth video game RWBY: Grimm Eclipse a few years before he voiced Pietro.
He has also voiced characters for several other video games, movies, and TV shows, notably including Lee Everett from The Walking Dead, Gabriel the Warrior from Minecraft: Story Mode, Lucius Fox from Batman: The Telltale Series, Malcolm Latimer from Fallout 4 and Pong Krell from the animated TV series Star Wars: The Clone Wars.