Heikki Hämmäinen is a professor of Network Economics at the Department of Communications and Networking, Aalto University, Finland. He has MSc (1984) and PhD (1991) in Computer Science from Helsinki University of Technology. His main research interests are in techno-economics and the regulation of mobile services and networks. Special topics recently include measurement and analysis of mobile usage, value networks of flexible Internet access, and 5G small cells. His earlier industrial career includes several management positions within Nokia.