Willner works with both documentary and staged photography, allowing the concept to determine the technique. Educated at ICP in New York, he holds an MFA from The University College of Arts, Craft and Design in Stockholm.
Two books have been published by him: Wind Upon the Face of Waters (Kerber/Skreid 2016) where the theme is faith and religion and Boy Stories (Hatje Cantz 2012). The latter highlights childhood memories and the series was also exhibited at Fotografiska, Stockholm 2012.
Currently living and working in Stockholm, Willner exhibits his work on a regular basis in Sweden and internationally. Since 2015 Willner also collaborates with Peo Olsson (Willner-Olsson) including both photography and land art in the series Heaps and The Bog.