He is best known as the creator of Lucky Star, which began serialization in Kadokawa Shoten's Comptiq magazine in December 2003.
He is also credited for creating Comptiq's mascot character Comp-chan (コンプちゃん, Konpu-chan).
While a member of the animation club in high school, he began seriously drawing manga and doing illustration work.
Katō appears in the Lucky Star manga series as the rabbit "Editor K".
[1] After that, Yoshimizu got commission work to do spot illustrations and stories in anthology comic releases, in addition to doing original manga stories to fill out empty spots in the magazine when manga series completed.