David Ullendorff

David Ullendorff, a father of four, was recently fixed along with his Wheaton Terrier and will stop breeding. He's an award-winning filmmaker as well as the president and cofounder of Mathnasium, a company dedicated to teaching K-12 math in a way that makes sense to kids, with over 400 centers worldwide.

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David Ullendorff

Frozen Fear

by David Ullendorff

A father's courage is put to the test in his own home.

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