Alex Schulz & Markus Schulz. Son of Markus Schulz. Markus Schulz born 3 February 1975 is a German trance music DJ and producer who resides in Miami, Florida, USA. He is best-known for his weekly radio show titled Global DJ Broadcast that airs on Digitally Imported radio, After Hours FM and other online stations. He is also the founder of the EDM label Coldharbour Recordings.