Guest Editorial: Special Issue on Parameterized Complexity

This Special Issue on Parameterized Complexity of Tsinghua Science and Technology is a tribute to the influential contributions of Jianer Chen to parameterized complexity algorithmics. It is an occasion to celebrate the many important contributions to this new and prospering branch of theoretical computer science made by Jianer Chen, as he reaches the ripe young age of 60. Happy birthday, Jianer, from the parameterized complexity community!