What did Michael Ruhlman write?

Michael Ruhlman wrote The Making of a Chef: Mastering Heat at the Culinary Institute of America, Ruhlman's Twenty: 20 Techniques 100 Recipes A Cook's Manifesto, Charcuterie: The Craft of Salting, Smoking, and Curing, Ratio: The Simple Codes Behind the Craft of Everyday Cooking and The Soul of a Chef: The Journey Toward Perfection.