To become a part-time controller, you must have significant professional experience and advanced qualifications in accounting, business administration, finance, and management. Typically, a controller has several years of experience as an accountant or auditor. As a part-time controller, you may also have some experience as a full-time controller, but are now working part-time as you near retirement or transition to other responsibilities. You need a bachelor's degree in finance, economics, statistics, or a closely related degree. An advanced degree, such as an MBA is also useful. As an accounting professional, you also must be a certified public accountant or CPA. Excellent leadership skills and strong analytical problem-solving are essential.