For Robert Mullen Jr., joining the printing ink industry was practically a natural. His father, Robert Sr., had worked in the industry for many years, and, as Mr. Mullen put it, “I was certainly familiar with the ink industry just from our dinner table conversations.” After college, Mr. Mullen decided that the ink industry was where he wanted to be. Today, he is the vice president of packaging ink sales for Sun Chemical, and he has served with distinction in a variety of trade associations. His...