It is with deep sadness that we announce the passing of Professor Yangquan Chen, a valued member of the Editorial Board of Control Theory and Technology.

Professor Chen made outstanding contributions to the journal and to the field of Control Theory and Engineering. His insight, generosity, and commitment to scholarly excellence will be greatly missed.

We extend our heartfelt condolences to his family, friends, colleagues, and all who were touched by his work and kindness.

— The Editorial Board of Control Theory and Technology  

30 April 2026