**About the Editors**

**William B. Grant** has a Ph.D. in physics from the University of California, Berkeley (1971). He is the director of Sunlight, Nutrition and Health Research Center, a non-profit organization founded in San Francisco in 2004., He has made 300 publications, including articles, reviews, editorials, and letters to the editor, regarding vitamin D listed at pubmed.gov. His main interest now is the study of solar UV exposure to produce vitamin D and nitric oxide for optimal health. His minor interest is proper nutrition to reduce the risk of chronic diseases. Twitter handle: @wbgrant2

**Ronan Lordan** is a researcher of circadian biology and nutrition at the Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, at the University of Pennsylvania. He received his BSc (Hons) in Biological Sciences with concurrent Education at the University of Limerick, Ireland. Here he continued his studies and obtained a PhD (Nutrition and Biochemistry). Ronan has also lectured in nutrition, genetics, and physiology at the University of Limerick. He has published several peer-reviewed articles, book chapters, and is an active reviewer and editor for several journals. His research interests include: (a) circadian biology and metabolism, (b) functional foods and nutraceuticals, (c) the role of nutritional status in COVID-19; and (d) discerning the mechanisms of platelet-activating factor-induced systemic inflammation in noncommunicable diseases. Twitter Handle: @el ronan
