You may not know the name Erwin Ephron, but if you’re a marketer, you certainly know his influence on marketing and media planning. Ephron, a highly influential media planner and consultant, left behind a legacy of marketing best practices that are still relevant today. Certainly you’ve had to figure out where best to place your ads so that they are exposed to the most people; or you’ve danced the line of how many ads you will need so that your desired audience sees the ad often enough to remember but not so much that they grow weary. How to effectively …