Weihain was one of my classmates during the Phd at LSE. We went together together to Atlanta and visited together the city. Although it was a very stressful time for all of us, he was always cheerful and was able to support everybody and made the atmosphere lighter. I will always remember with fondness the time we spent together. I was also impressed with his careful academic work, which I had the opportunity to discuss in one of the early job markets seminars. Although it was not my field, it was great to discuss with him and he was very eager to clarify and discuss all the aspects of his work. It was a very enriching experience for me. Weihan was a good friend, a careful scholar and he will be sorely missed. My thoughts and prayers go to his family in this terrible moment.