John Ramirez is an American voice actor known for his work on English-language dubs of anime, primarily in productions from Sentai Filmworks, with whom he is affiliated. His career background includes providing voices for a range of supporting characters and additional voices across several anime series. One of his notable early roles was in the long-running sports anime Haikyu!!, where he voiced Reon Ohira, a wing spiker for the Shiratorizawa Academy team, as well as Shunki Kawatabi and other additional voices. Beyond Haikyu!!, his major voice roles include Kento Sawa in the basketball anime Ahiru no Sora and Dave in the Sentai Filmworks dub of Baki. He has also contributed additional voices to Grimoire of Zero and the second season of Is It Wrong to Try to Pick Up Girls in a Dungeon?. While specific recurring collaborations are not detailed publicly, his body of work shows repeated association with Sentai Filmworks productions in Houston, Texas. Notable achievements include working on several high-profile anime titles, contributing to the English adaptations that bring these series to international audiences.