Professor Dan Sullivan retired in December 2021 after serving for 23 years as a Professor of Nutrient Management with an emphasis on organic cropping systems in the Crop and Soil Science Department at OSU. During his time at OSU, Dan worked extensively on understanding organic nutrient sources including manure, municipal biosolids, and compost. Dan also provided guidance to both Extension clientele and students in the areas of Oregon soil fertility and nutrient management. We greatly appreciate Dan’s commitment to OSU and wish him all the success in his retirement, his humor and his extensive nutrient management knowledge will be sorely missed.