The dying concept of spending an entire career with one employer, rollbacks in corporate hiring, expansion of individually owned 401(k) retirement plans and technological advances spark entrepreneurial activity even in recessions, said Mark Loschiavo, executive director of the Baiada Center for Entrepreneurship Technology at Drexel University in Philadelphia. "The risk equation is changed in terms of job security," Loschiavo said. "You're faced with challenges every step of the way. Most entrepreneurs have a strong internal locus of control."