Ishizuka is best known to most fans as the voice of Heihachi Mishima in the Tekken video game series, JoJo's Bizarre Adventure's old Joseph Joestar, Cowboy Bebop's Jet Black, Pokémon's Professor Oak, Dragon Ball's Mr. Satan, Fullmetal Alchemist's Van Hohenheim, Naruto's Zabuza Momochi, Initial D's Bunta Fujiwara, and Lilo & Stitch's Gantu.
To tokusatsu fans, he is best known as Choushinsei Flashman's Great Emperor Lah Deus, Doubutsu Sentai Zyuohger's Larry, and Ultraman Zero's Beatstar. He is also the official Japanese voice for Liam Neeson and Laurence Fishburne. He also played the narrator in various anime, most notably in Giant Gorg and Sword Art Online Alternative: Gun Gale Online. From all of us here, thank you for the memories.
[Source: Anime News Network, Wikipedia (roles)]