For your application, nothing about your story makes me think there is any reason why you cannot be admitted, but nothing stands out telling me why you should be admitted. All of the reasons why a top program would admit you are in the details of your work experience, personal experiences, personality, values and overall story.
I recommend you read this case study of a candidate with a low GPA who was accepted into a top MBA program: http://www.stacyblackman.com/comprehens ... ies/case5/
We also have free school specific advice for Columbia here: http://www.stacyblackman.com/business-s ... -school-2/
As a note, Columbia has a unique early decision option. If you are truly interested in the school, applying early can give you the added edge due to a stronger indication of interest.
If you'd like, we also provide free 30 minute phone consultations here: http://www.stacyblackman.com/contact/
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Stacy Blackman | Stacy Blackman Consulting Inc | http://www.StacyBlackman.com | +1 323.934.3936
MBA blogger, US News and Author, The MBA Application Roadmap