People who know and work with Pete Nelson describe him as a tree whisperer. For his part, Nelson lets the trees do the talking. He's a world-renowned treehouse designer and builder, and this series documents the work he and his team of craftsmen—including his son Charlie—do to create incredible homes and businesses in nature's canopy. Pete uses a combination of science and art to realize clients' sky-high aspirations of magnificent multi-bedroom treehouses with elaborate kitchens and bathrooms, ...