Seonghyun (Sean) YoonApr 23, 20202 min[Competitions] 2018 Rachel Carson Intergenerational Sense of Wonder Contest
Seonghyun (Sean) YoonApr 23, 20207 min[Competition] 2020 HOBY Youth International Environmental Laws and Agreements Proposal Essay Contest
Seonghyun (Sean) YoonApr 23, 20204 min[Lecture] UPenn-Designing Cities 1: The past, present, and future of cities