I am a logician at the department of philosophy of Peking University. Currently, I am a tenured associate professor of logic and the deputy chair of the department and also the deputy director of the PKU Centre for Philosophy and the Future of Humanity. My research mainly focuses on modal logic and its applications in philosophy, theoretical computer science, and AI. In recent years, I have been trying to systematically propose and study logics of know-wh, such as knowing how/why/what/who and so on. The core idea is to introduce the so-called bundled modalities which pack a quantifier and a modality together. This also leads to some new decidable fragments of first-order modal logic and a general approach to unpacking intuitionistic logic, inquisitive logic, and related non-classical logics as epistemic logics. Here is my CV. You can also find my papers at DBLP, Google Scholar, and Researchgate. My Erdős number is 3.