He earned an aeronautical engineering degree from the University of Tokyo and worked for Honda Motor Co., Ltd. for 20 years, overseeing the introduction of its CBX motorcycle, design of their F1 racing engines for the RA273 as well as being the president of Honda of America Inc.[1] He resigned in 1992 due to a heart problem, and started a Chinese traditional treatment to restore his condition.
During this time, it was said that General Motors recruited Irimajiri for a senior executive position at the company, in light of his success at Honda.
While president of Sega he invested $5 million into Nvidia, after the tiny Silicon Valley startup had failed to deliver on its contract to create the graphics chip for the Dreamcast.
[6] In 2017, Huang returned the favor by honoring a request from Irimajiri to speak to a small group of business leaders while visiting Japan.
[6] Irimajiri's most recent position was as chairman of Asahi Tec, a Japanese manufacturer of aluminum parts and castings for automobiles, owned by Ripplewood Holdings.