A LIFELONG FRIENDSHIP AND FRUITFUL COLLABORATION: A JOURNEY OF MORE THAN 30 YEARS WITH GEORGE YIN.

This article highlights my lifelong friendship and collaboration with George Yin on developing new methodologies in diversified fields in control theory and their branches, as well as their engineering and medical applications. It explains the roots and motivations in initiating these problems and George's critical contributions in applying his extensive expertise in stochastic systems to bring these challenging pursuits to fruitful new frameworks and methodologies. [ABSTRACT FROM AUTHOR]