"Well, it's that time again . . . time to bring out another edition of the book. As always, a new edition offers authors an opportunity to update, revise and generally 'improve' the text. This time however the text has faced additional needs for new material in order to reflect the impact of the most challenging health threat to the world experienced in this century: COVID-19. This condition has inspired significant medical developments and has also presented several challenges to health (and clinical) psychologists, to public health professions, and to health practitioners in primary, secondary, and tertiary care across the globe"--