When former Google employee Marissa Mayer took the position as Yahoo CEO, many said she would bring along Googlers. Patricio Robles gives us five tips on how to hold on to knowledgeable and trusted employees, especially experts in search engine marketing. Most tips that Robles provides are common sense, such as don't hire job-hoppers and be careful of promising too much or something that is not easily attainable. While there's no foolproof way to keep employees from "greener pastures," companies can increase the odds that they will stay on.