Karen Wang Diggs is a classically trained chef, nutritionist, and author of Happy Foods – Over 100 Mood Boosting Recipes.

After graduating from the California Culinary Academy, she worked at the Mandarin Oriental Hotel in Hong Kong and helped open several restaurants before returning to the Bay Area. Seeking a shift from restaurant life, she earned her certification as a nutritionist, where she discovered the powerful health benefits of fermented foods.

Driven by a passion to make fermentation accessible, Karen designed Kraut Source—an elegant system that transforms wide-mouth mason jars into fermentation vessels.

Through her work, she continues to inspire people to create sauerkraut, pickles, and other ferments easily at home.