General area of research interest involves development of cultural and postharvest practices for fruit, vegetable and mushrooms to improve their composition, quality, stability and safety of food products produced from them. Recent research has focused on development of methods to enhance the levels of important bioactive components of cultivated mushrooms in order to improve their nutritional/and or medicinal value.  For example, commercially practical methods have been developed to enhance the levels of selenium, ergothioneine and ergocalciferol (Vit. D2) that can make mushrooms, or their products, as the best sources of these compounds in a plant-based diet.