In a career spanning five decades she worked with and groomed popular food authors including Rose Levy Beranbaum, Rick Bayless, Julie Sahni, Fuchsia Dunlop, J. Kenji López-Alt, and Judy Rodgers.
[2] Guarnaschelli started her publishing career with Scribner's and later with William Morrow before joining W. W. Norton & Company in 2000, where she would go on to become a vice president and serve until her retirement in 2017.
[2][1] Some other culinary writers with whom she had worked include J. Kenji López-Alt with The Food Lab, Judy Rodgers with The Zuni Cafe Cookbook, Maricel Presilla with Gran Cocina Latina, and Rose Levy Beranbaum with The Cake Bible.
[3] One of Guarnaschelli's more ambitious projects was the seventh edition of Irma S. Rombauer's 1931 classic Joy of Cooking, an originally self-published book which was the best-selling cookbook in US history at the time.
[1] In a career spanning five decades, Guarnaschelli was known for bringing a rigorous approach to the testing of and quality of recipes, preferring accuracy over ease of preparation, and she pushed cookbook authors to think beyond the French and Italian cuisines familiar to most Americans.
[2][5] She died on February 6, 2021, at the Northwell Health Stern Family Center in Manhasset, New York, from heart disease and related complications.