Klaus's newest book is A Self Made of Words: Crafting a Distinctive Persona in Nonfiction Writing (October 2013). His other work on persona is The Made-Up Self: Impersonation in the Personal Essay. He is also co-editor with Ned Stuckey-French of Essayists on the Essay: Montaigne to Our Time. A special page devoted to Essayists on the Essay can be found on Facebook.
Klaus's literary nonfiction includes My Vegetable Love, Weathering Winter, Taking Retirement, and Letters to Kate —essayistic works in the form of diaries and letters that reflect on his life and marriage, on gardening and food, on work and retirement, and on his abiding concern with time, change, and mortality. His current work-in-progress is Aging: An Octogenarian's Recollections.
Klaus's reflections on the essay and on nonfiction writing can be read in an interview on The Millions: "When We Aspire to Write Like Ourselves." Klaus's reflections on style, voice, and self-presentation can be heard in an essay that he delivered at the Iowa Summer Writing Festival, "Days into Daybooks: A Voice for All Seasons."