With a career spanning over 40 years (beginning in the late 1970s), he is best known for his works as a record producer for acts including various choir members Mike Wyzgowski, Misia, Satoshi Tomiie, and Ken Hirai.

Sagisu's career in music started in 1977, when he became one of the members of jazz fusion band T-Square.

By 1997, he had composed over 2,000 songs, advertising jingles and TV and movie pieces.

[6] Sagisu won the Tokyo Anime Award for "Best Music" in 2010 for Evangelion: 2.0 You Can (Not) Advance.

[7] Sagisu arranged a rendition of the Japanese national anthem, "Kimigayo", performed at the 2020 Summer Olympics opening ceremony by Misia.