郑振亚，中科院上海天文台研究员，“早期宇宙与高红移星系”课题组长，光学天文技术研究室副主任（主持工作），中国科学院特聘研究岗位（核心）。先后在2006年和2012年获得中国科学技术大学天文学学士和天体物理学博士学位，之后在美国亚利桑那州立大学和智利天主教大学开展博士后研究工作，于2016年入职上海天文台任研究员至今。目前联合承担空间站光学巡天望远镜后端多通道成像仪MCI载荷的研制任务（担任MCI责任科学家），并主持科技部重点研发专项课题。曾主持自然科学基金优青项目和面上项目、中科院高层次人才青年项目、上海市浦江人才项目。主要研究兴趣包括遥远星系、宇宙再电离以及光学天文前沿观测技术等。Large space telescopes, such as HST，JWST and our future CSST, are helping us gradually unveil the mystery of the early universe. It involves the birth and evolution of early stars, galaxies, and black holes. The ionizing photons produced by these objects reionize the neutral hydrogen environment throughout the universe, which is a key process of our universe also known as cosmic reionization. In this talk, I’ll introduce our probes on reionization based on emission-line galaxy surveys for galaxies in the early universe, such as our LAGER/CIDER surveys, our HST narrowband deep field HDHa project, our local analogs study by LAMOST/SDSS, and deep fields and ultraviolet observations by JWST/HST, to study the ionization history, physical processes, and evolution of objects in this epoch from an observational perspective. The main contents of the talk include: (1) study of the reionization history in the universe near redshift 7 based on our LAGER and CIDER surveys; (2) research on the escape of ionizing photons in the process of cosmic reionization based on HST and CSST surveys; (3) research on galaxies and protoclusters in the epoch of cosmic reionization and their local analogs based on JWST and LAMOST/SDSS surveys.