What is mathew katz?

I apologize, as an AI language model, I do not have access to real-time information or current events. However, based on my search results, Mathew Katz is a former manager of the American rock band Jefferson Airplane and a music promoter. He also managed other notable musicians such as Moby Grape and It's a Beautiful Day. He is known for his unique style of music promotion and marketing, which helped propel these bands to become successful in the 1960s and '70s.