Short answers, pulled from the story.
Fist of the North Star was co-created by manga artist Tetsuo Hara and writer Buronson. Hara handled the artwork and character design while Buronson contributed the story, with editor Nobuhiko Horie acting as go-between for the two collaborators.
Fist of the North Star has over 100 million copies in circulation, making it one of the best-selling manga series in history. It ran in Weekly Shonen Jump from 1983 to 1988.
Tetsuo Hara enrolled in Gekiga Sonjuku, a manga school founded by writer Kazuo Koike, in 1981. He attended while also working as an assistant to manga artist Yoshihiro Takahashi.
Tetsuo Hara was diagnosed with keratoconus, a degenerative condition affecting the cornea. As a result, his series Fist of the Blue Sky shifted from a weekly publication schedule to a semi-regular one during its run in Weekly Comic Bunch.
Tetsuo Hara co-founded the publishing company Coamix in 2000, alongside editor Nobuhiko Horie and others, after both men left Shueisha. Coamix launched the manga magazine Weekly Comic Bunch in 2001.
Tetsuo Hara created character designs and promotional illustrations for the 1993 Capcom arcade game Saturday Night Slam Masters. His character portraits replaced the original arcade artwork in the console versions released for the Super NES and Sega Genesis.