Ullman introduced significant strategic changes when he became CEO of JCPenney. He launched a "Just Call Me Mike" poster campaign to promote a friendly workplace culture. He made the dress code more flexible and disbanded the strict "Office Police" team. Ullman also introduced training programs for employees and identified high-potential workers to develop future leaders. These changes helped shift JCPenney from an inert culture to a more adaptive culture focused on innovation and employee empowerment.