A graduate in Fine Arts, he served as curator and taxonomist at the Holguin´s Museum of Natural History Museum, contributing to the description of new species for science in Cuba and building a solid career in biodiversity research.

He is the author and illustrator of the Endemic Birds of Cuba, A Comprehensive Field Guide (2015) and the Annotated Checklist of the Birds of Cuba (2017–2026), both important references for the study and monitoring of Cuban avifauna. Nils coordinates international conservation projects and collaborates as an eBird editor and reviewer in Cuba, contributing to the quality and reliability of ornithological records.He was one of the pioneers and leading promoters of the birdwatching movement in Cuba.

Como artista ha recibido numerosos galardones entre los que se cuentan dos Premios de la Ciudad y el Premio Nacional "Excelencia del Arte" y ha participado como jurado en diversas exposiciones. Ha impartido talleres para promover y preparar a las nuevas generaciones de ilustradores y artistas de la naturaleza. Posee obras en colecciones privadas en Cuba, Estados Unidos, Canada, Inglaterra, Finlandia y México.

His birdwatching and nature tours are designed for experienced birders, enthusiasts, photographers, and travelers seeking an authentic and professional experience. Each itinerary combines strategic planning, up-to-date knowledge of birding locations, and a strong scientific approach, offering immersive experiences that integrate advanced identification, ecological context, and Cuban culture.

Nils is currently developing a new Field Guide to the Birds of Cubaillustrated with his own watercolors paintings, distinguished by high anatomical accuracy and refined artistic technique.

His purpose is clear: to study, illustrate, and promote Cuba’s natural richness with respect, scientific rigor, and a vocation for service.