He started his photography work while working in a darkroom of a London-based advertising agency. It's during this period that Trevillion worked with a photography and printing firm. He would later start his printing firm called Metro Imaging during his 20's, doing so as a result of his passion for fine-art printing techniques. The printing firm, located across Europe remains among the top printing firms of the continent. But due to his discovery of landscape photography, capturing the beautiful natural world, he opted to stay away from Metro Imaging to focus solely on landscape photography. Trevillion then developed a unique style of landscape photography that conspicuously expresses emotion and sensitivity.