From Sega Retro
|Place of birth: Tomioka, Fukushima prefecture, Japan|
|Company(ies): Sega of Japan|
|Education: Chitosegaoka High School, Nihon University (Electrical Engineering) (1970)|
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Masaharu Yoshii (吉井 正晴) is a programmer who joined Sega in April 1970 and left in May 2000, later joining CRI Middleware Co., Ltd. where he worked from 2001-2010.
- Quake III Arena (Dreamcast; 2000) — Special Thanks
- Sega Smash Pack Volume 1 (Dreamcast; 2001) — Special Thanks
- Sonic the Hedgehog 2 (1992) — Director
- Sonic the Hedgehog 3 (1994) — Project Manager
- Sonic & Knuckles (1994) — Project Manager
- Sonic the Hedgehog 3 & Knuckles (1994) — Project Manager
- Sonic Adventure (1998) — Software Support
- Sega Swirl (2000) — Special Thanks
- Silent Hill 2: Restless Dreams (2002) — Special Thanks