Sound engineer, producer, bassist and designer from San Francisco, California, USA. Born March 31, 1953; died on October 29, 2023. Worked as mastering engineer at [l122360], [l210603], [l13769] and owned and operated A. Hammer Mastering.

At Fantasy, he signed his cuts by etching GH in the runouts (with the tie of the G becoming the crossbar of the H).