John Kiffmeyer (born July 11, 1969), known professionally as Al Sobrante, is an American cinematographer and retired musician and songwriter.

[2]: 12  Because of his experience and knowledge of the underground community, Kiffmeyer was able to get the young band on its feet by placing calls to friends, among them prominent figure of the East Bay Larry Livermore.

The group's first full-length effort, 1990 album 39/Smooth, would feature a Kiffmeyer original, "I Was There", which documented the band at that place in time.

In 1998 he was the executive producer of The Great Lost Trouble Makers Album by The Troublemakers, a garage rock band from Sacramento, California.

[citation needed] On April 16, 2015, Kiffmeyer joined Billie Joe Armstrong and Mike Dirnt on stage during a Green Day concert at The House of Blues in Cleveland, Ohio, where the trio performed as Sweet Children and played songs that they had not performed since the 1990s, including "Sweet Children", "Green Day", "I Was There", "Don't Leave Me" and "Dry Ice".