by Johnnie » 25 Jan 2011, 14:55
I'm not particularly aware of gerontology as a "branch of biology" (my sister has a master's degree in gerontology and both a bachelor's and doctorate in psychology), but usually your doctorate would be in a broader field, with your dissertation focused on the specific research topic of your interest. There is an advantage to having your doctoral degree in a broader subject matter, because there are usually a limited number of positions available in a specific branch, but you may be able to get one in the broader field. For example, my doctorate is in marketing. My specific branch of marketing is consumer behavior, but that refers primarily to my research interests, not to what I am able to teach. While I have taught consumer behavior courses over the years, I have also taught courses in a broad range of other subject matters within marketing, which makes me more useful to employers.