Matsuoka Atsushi (Acchan) is a choreographer and dancer, and the president of HIDE&SEEK Inc., a company that produces dance entertainment.

He has choreographed for numerous idol groups including Nogizaka46 and SKE48, as well as for voice actor concerts, music videos, and commercials. In addition to choreography, he plans and directs live concerts.

As a performer, he remains active as a dancer and is recognized for his self-produced dance performances that combine cutting-edge technology with choreography.