Jamie Oliver is a British chef, restaurateur, and food campaigner known for his approachable cooking style and emphasis on healthy eating. He gained fame in the late 1990s with his television show, The Naked Chef, which showcased simple recipes and fresh ingredients. In addition to his television career, Oliver has authored numerous cookbooks and launched several successful restaurant chains. He is also recognized for his advocacy work in improving school meals and promoting nutrition education, particularly through initiatives like Food Revolution Day.