With almost 15 years of work experience, you may want to consider executive MBA programs; the GMAT requirements vary for executive programs, so you'll certainly want to check them before preparing for the standardized test. Deadlines begin next month and run through early next year, the earlier round you apply in, the better off you'll be.

I'll need to have a fuller picture of your experience, qualifications and interests to give you a better sense of schools to consider. Feel free to contact me directly (below) for an admissions assessment.