<p>I have been in and around arts administration (although not specifically theater) for 30+ years, and one thing I can tell you is that most people working in arts management have degrees either in the arts themselves or a liberal arts degree with extensive arts training. Very few (I have not met any) have arts management degrees. You get a work in arts administration by working in arts administration-- that is to say, your internships, paid and unpaid, will be the connections that help you to find real work. If, as you say, you want work in financial planning, a business degree with a theater minor (or just a lot of theater experience) might be the way to go.</p>