Whitney Johnson’s “Disrupt Yourself: Putting the Power of Disruptive Innovation to Work” (Bibliomotion) may be the “What Color Is Your Parachute?” career guide for the entrepreneurial age. Johnson applies Harvard Business School professor Clayton Christensen’s theory of disruptive innovation to career development. Christensen’s theory explains how small, nimble competitors can nibble away at the business of successful companies and come out on top. Johnson laces her book with mini-case studies of people who have created their own jobs or businesses. She urges readers to take risks, identify unmet needs in the marketplace, work to address them, and be prepared to shift your strategy.