This is a field where education requirements tend to be fairly cut and dry. A scant few entry level positions may be available for graduates with a bachelor's degree in one of the biological sciences, but the grand majority of research positions will require at least a master's degree in Marine Biology. Those who wish to work their way into a position of authority, directing research projects, will most likely need to earn a doctorate in Marine Biology. In other words, if you want to do your own work, rather than someone else's, you'll need a Ph.D. Interestingly, many working marine biologists recommend that someone interested in a career in marine biology get a degree in a different biological science first, and specialize in marine biology for their post-graduate work. Specialization in a particular discipline is considered a key turning point in the career of a marine biology graduate.