Mavis Huntley is the head of integrated production at John St., a marketing and advertising agency. She outlines 6 steps for effective marketing campaigns: 1) respect the client brief, 2) build relationships, 3) make the campaign eye-catching, 4) simplify complex issues, 5) avoid being defensive, and 6) ensure the conclusion leaves the desired impact. The document advocates focusing on the client needs and creating memorable marketing solutions.