Jean-Baptiste (Pierre Antoine de Monet, Chevalier) de Lamarck was born on August 1, 1774 and died on December 18, 1829. Lamarck was a French naturalist. Lamarck thought of 'Inheritance of Acquired Characteristics, Jean Lamarck's theory was the 'Theory of use/disuse. He was the very first person to create and idea of how evolution occurs. The example used most is giraffes necks. Over time, if there structure is used enough then it will develop better. His ideas were proven wrong but he did challenge peoples ideas about evolution.