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Located: The Netherlands Home Town: Rhenen, close to some of the most extensive forests in the Lowlands. Main Sport: Trail running Other hobbies/Interests: More trail running, mountain biking, dogsledding and mountain trekking. Background: Jef has a master’s degree in Biology with a specialization in animal behavior and ecology. He is an International Mountain Leader, a Certified Wilderness Guide and a Wilderness First Responder. Jef is passionate about sharing his love for wild places, an active lifestyle and wildlife photography, whether it is on the cold and wet tundra, at high altitude in the mountains or the extensive savannah plains, in dense tropical rainforest or bone dry deserts. He has years of outdoor experience in his backpack: extensive photo expeditions in some of the world’s most remote areas, several years as a safari guide and manager of remote luxury tented camps in east Africa, long unsupported trekking through vast wilderness. Jef is guiding international guests on mountain trekkings and nature tours throughout the world for different companies. He can be found guiding guests on trail running trips, dog-sledding tours, expedition trekkings through large mountain ranges, tundra, rainforest and deserts, snowshoe walking, x-country skiing and safaris. Throughout his work nature conservation is an important aspect. He is known to show his guests “the great dance of life”, because everything is interlinked in nature. Furthermore, Jef embraces the overwhelming effect that physical exercise has on us, modern men. As a former elite ultra-distance runner he knows exactly what it takes to push your own limits. Besides Jef is a scriptwriter for wildlife documentaries and author for different magazines.