Jamie Van Leeuwen sees strength in numbers.

Van Leeuwen is the associate executive director of Urban Peak, a center for homeless youth based in Denver. He works with drug addicts, many of whom he meets on Denver’s 16th Street Mall, trying to help them get off the streets, sober, and into apartments of their own. But lately, he has also been traveling the country, presenting at conferences in cities like Austin, Texas, Washington, D.C., and Phoenix, speaking on a topic that for him has become...

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