Yoshiaki Hasegawa is a Japanese voice actor, actor, and narrator born in Tokyo on October 21, 1984. He is affiliated with the talent agency Across Entertainment. His path to voice acting began after he was inspired by a film during his university years, which led him to train at a stage acting school and begin working as an actor. He became a freelancer before a friend introduced him to Across Entertainment, and he officially started his voice acting career in 2010. His debut in voice acting was through the radio drama "Nissan A, Reiji Abe: Beyond the Average".

Hasegawa has built a career with a wide range of roles in anime television series. A significant early milestone was his first leading role in 2016 as Hayato Kisaragi in the series "Hundred". He is also known for his work in several of the titles mentioned. He voiced Satoru Enishi across multiple installments of the "Cardfight!! Vanguard G" franchise, including "Gear Crisis-hen," "Stride Gate-hen," and "G NEXT". In 2020, he played the role of Abukawa in "Gleipnir". The following year, he took on roles such as So Sato in "PuraOre! Pride of Orange" and Koumori-senpai in the surreal series "Sonny Boy". In 2022, his work included playing Tetsuya Mikami in "Engage Kiss" and Haruto Kujikawa in "VazzRock the Animation". He also voiced the character Tōma in "Yo-kai Watch: Shadowside".

Beyond these, Hasegawa has appeared in numerous other popular anime. His filmography includes roles in "One-Punch Man" (as Hero Association staff and others), "The Ancient Magus' Bride" (as Jasper), "Welcome to the Classroom of the Elite" (as Kyogo Komiya), "Vinland Saga," "Demon Slayer: Kimetsu no Yaiba," and the feature film "The First Slam Dunk" (as Minoru Matsumoto). His work extends to video games as well, with roles in titles such as "Project X Zone," "Puyo Puyo!! Quest," and "Dream Kingdom and the 100 Sleeping Princes".

In addition to his anime and game work, Hasegawa has been involved in stage performances, radio shows, and drama CDs, sometimes performing character songs for the roles he plays, such as for his character in "Hundred" and the multimedia project "VAZZROCK". He has also appeared in live-action television dramas prior to focusing on voice acting.