Although your GMAT score is below the average of Haas's part-time program (the average GMAT score is 700), part-time MBA programs will focus more on your work experience than your GMAT and undergraduate record. Top MBA programs, which Haas certainly is one of, are looking for individuals with leadership experience, so you will need to stress this in your application. They want individuals who have made an impact and will continue to do so. I recommend you focus on these areas as much as you can in your personal essays and letters of recommendation.
I also suggest that you read this case study of an engineer who differentiated his application through his leadership experience, and subsequently was accepted into Columbia, Tuck, and MIT.http://www.stacyblackman.com/comprehens ... ies/case2/
I hope this was of help.
Conrad and the Stacy Blackman
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MBA blogger, US News and Author, The MBA Application Roadmap