Casimiro is the founder, editor, and publisher of Adventure Journal, the critically acclaimed print quarterly covering outdoor recreation, public lands, nature, and the wholecloth human experience of a life driven by curiosity.

Previously, he was the West Coast editor of National Geographic Adventure (1998ish-2009), the editor of Powder magazine (1987-1998), and the founding editor of Bike magazine (1993-1998). His visual work is represented by Getty Images and he taught photography for National Geographic Expeditions.