Assistant Principal by day, rapper by night, Joe Truss might be the coolest adult in the entire San Francisco Unified School District. Watch in the above video as Truss raps with his former Lowell High School classmates, Carlos Teasdale and Daniel Velarde, plus gets his Academy of Arts and Sciences students in on the act.

As the San Francisco Bay Guardian reports, Truss, Teasdale, and Velarde formed their group Some of All Parts in 2007. The trio tackles issues of social justice, racism, police brutality, and even the environment. In the song "Rappers Ain’t Sayin’ Nothin’," they make a valid point that popular hip-hop is lyrically weak.

Academy of Arts and Sciences recently set aside funding for a music studio, in which Truss plans to teach students about rapping and making music.

[San Francisco Bay Guardian]