Adam Grant received his bachelor’s degree from Harvard University and later became the youngest Professor at Wharton Business School. Grant has studied humans based on a framework of three categories: Givers, Takers and Matchers. In short, Givers helps even when the benefits to others outweigh their personal cost. Matchers want to achieve an even balance between giving and receiving. Takers help only when their benefits outweigh their personal costs.
A ”Brief” of the book can be read here.