His substantive professional experience was superintendent of a Denver school system that saw an enormous amount of reforms that he can proud of.

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Airlines reported more than 200 cancellations at Denver International Airport on Wednesday after the storm system dumped up to 7 inches of snow in the area and much more in the mountains.

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In 1996, Denver's public schools went back to the neighbourhood system for the first time in more than 20 years.

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Federal tax credit: The federal government offers a 30% investment tax credit on the cost of the system after rebates. (The credit is higher in Denver, for example, because there is no state or utility rebate.) To claim the full credit, your tax bill must be bigger than the credit.

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Mark Musselman, an executive consultant for McGhee Productivity Solutions, in Denver, says one senior executive he coached was so frustrated after trying to learn a new system that "he was ready to throw up his arms and stop doing it" after a month.

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