The first part of this talk will be the research highlights of my galaxy cluster studies. While I keep deep optical imaging campaigns on galaxy clusters, my research interests also have expanded into the environmental effect on galaxy evolution and the high-z galaxy clusters. Recent results and ongoing observational projects in which I am closely involved will be introduced. The second part will be a brief introduction to Astronomy in Chile. I would like to share my experiences of the research environment in Chile as a Chilean astronomer.