Heikki is one of the best professors who derserve a lot of respect. Last year, I had the chance to take the course Game Theory. His charming voice and clear logic to explan explicitly for every details in the class still echo in my mind. With a heavy heart, I memorize the pleasure time when we talked about the puzzles in the office. All the time and experience with Hekki is, and will be, a treasure of my life