Remember that there is much more to your profile than just your GMAT score! A lot depends on your professional experience (the quality, not just quantity), your extracurricular engagement and your community leadership. Though it's not common, it is possible to overcome a 630 score, but it really depends on the quality of the rest of your profile.
Based on what you've told me though, I think you might want to consider an executive MBA program if you can? With 10 years of experience, it seems that would be more suited to your level.
If you're targeting Emory, a 630 may be quite low. Without knowing more about your profile, it is difficult for me to assess your chances. And, without knowing more about your interests/goals, it's difficult for me to suggest schools. I would say that with a 630, I'd suggest targeting Tier 2 schools like University of Maryland, George Washington, etc.
Hope this helps as a start - feel free to provide more info.
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