An awful lot of people have internalized the old rule that your resume should be only one page and go through incredible contortions to keep their resumes down to that, even when they have years of experience.
The good news: The one-page-resume rule is dead. In fact, it’s been dead for a while. Two-page resumes are common now, so if you’ve been agonizing over how to stick to one page, agonize no longer.
However, there’s one big exception to this, and that’s if you have only a few years of experience. If that’s you, you should stick to one page. It looks a little silly to see someone two years out of school with a two-page resume; it’s rarely needed, and you’ll generally come across as a little self-important or unable to edit. There are exceptions to every rule, of course–but in my experience, everyone thinks they’re the exception on this, when only a small minority of people really are. So be brutal about sticking to one page if your experience is limited.
Read more at INC.