Who is the creator of the FISH philosophy?

"The origins of Fish Philosophy go back to John Christensen's observations of the Pike Place Fish Market in Seattle. Christensen observed that the employees had great fun while interacting with their customers who also enjoyed the experience. As a result of his observations Christensen formulated the four key concepts of the Fish Philosophy which are Play, Make the customer's Day, Be engaged and there for coworkers, Choose your Attitude."