This thesis aims to broaden the understanding of how human capital and graduates’ geographical mobility affects their individual careers as well as the firms, scientific systems, and countries in which they work. Firstly, it investigates the relationship between human capital, R&D, and productivity across different economies and industries. Secondly, it analyses whether interregional graduate mobility, as well as educational and cultural diversity among employees in a firm, have a positive effect on productivity. Subsequently, it studies how the interregional mobility of graduates affects their chances of obtaining a job in line with their qualifications. Finally, it investigates the role of geographical mobility for scientific upgradin...