Short answers, pulled from the story.
Osamu Saka started his professional voice acting career in 1963 when he voiced Gavan in the anime series Gigantor. He was 24 years old at the time of this debut during the early days of Japanese animation.
Osamu Saka voiced Grandpa Son Gohan in the anime series Dragon Ball starting in 1987. He also played Daisuke Aramaki in Ghost in the Shell: Stand Alone Complex in 2002 and reprised that role in 2020 for Ghost in the Shell: SAC 2045.
Osamu Saka voiced Alien Baltan Jr. in The Return of Ultraman episode 41 in 1971 and appeared as Zoffy in Ultraman Ace episode 31 by 1972. His work included roles such as Alien Stora, Alien Bat, Bearconger, and Undergroundmon across multiple episodes of these shows.
Osamu Saka voiced Colonel Sergei Gurlukovich in Metal Gear Solid 2: Sons of Liberty released in 2001 and returned as The End in 2005. He provided voices for Dr. Dimitri Yuriev in Xenosaga Episode II, John Waals in Detective Pikachu in 2016, Tengu in Dead or Alive 2, and the narrator in Ninja Gaiden.
Aoni Production retained Osamu Saka as an affiliate for most of his career spanning five decades. This affiliation supported his transition from anime dubbing to live-action film voiceovers while maintaining a steady presence in the industry.