This monograph was inspired by the life and work of Professor Michio Yanai, a seminal figure and dedicated mentor in tropical meteorology. Conceived initially at the AMS Michio Yanai Symposium as “lessons” organized around the principal research areas that attracted Yanai’s attention and passion, this collection represents both a lasting tribute to the Professor and his legacy, and a useful reference for scientists in all stages of their careers. Also included are personal reminiscences from Professor Taroh Matsuno and a biographical sketch of Yanai’s life with contributions from Professor Steven Esbensen, one of Yanai’s earliest students during his forty-year career at UCLA.