In recent years, a growing number of overseas Chinese students and immigrants return to China to take advantage of the development opportunities by engaging in business. Their roles in business receive increasing attention from policy makers, the media and scholars. This chapter intends to provide a review of the relevant literature. We note that returnees have started playing an important role in the society since 1840s. Returnees contribute to the modern business through facilitating knowledge transfer, increasing innovation, boosting productivity and ensuring economic growth. The evidence from other countries and the disadvantages of returnees are also discussed.