Work experience in business can be a plus, but experience in another field isn’t a mark against you. Your essay should explain the skills you've learned in your work and how they apply to a business career. For example, if you've worked as a teacher, you've developed organization skills and supervised diverse groups of people who produce work that you evaluated — all skills highly related to working in business. You can strengthen your application by volunteering for a group or organization that allows you to develop leadership, budget management, or other management skills.