He was a columnist for Mix Magazine with which he collaborated for 18 years, authoring the popular "Fast Lane" column until right up to his death. Prior to that, he was a technical editor and consultant to R-E/P magazine and created the "Living with Technology" column.He founded Marshall Electronics (not to be confused with Marshall Amplifiers or Marshall Electronics of Torrance, California) and was one of the first digital mastering engineers to use the first true stereo Real Time Analyzer, which he designed himself (Intelligent Devices AD-1 Pro Audio Analyzer).He also designed and built the Marshall Time Modulator. He redesigned the interface for the Quantec Room Simulator. He also held dozens of patents worldwide in technologies not associated with audio.