Delaram Pouyabahar, an Iranian computational biologist, lost her chance to join Harvard University due to a new US travel ban announced on June 4, 2025. The policy expanded a 2017 ban to 19 countries, including Iran, and removed all visa pathways for students and researchers from these countries. Pouyabahar had completed interviews, fellowship applications, and a visa interview in Toronto before the ban stalled her visa process. She specializes in machine learning for single-cell RNA sequencing and is a well-cited scientist in her field. Unlike the 2017 ban, which allowed some student and researcher visas after delays, the 2025 ban offers no exceptions. Universities like Harvard warn dozens of researchers from banned countries may be unable to start their positions. Higher education groups estimate over 10,000 students and scholars could be affected nationwide. Pouyabahar tried to speed up her PhD defense to avoid the ban but failed. When she asked for exceptions, officials said none were likely. With no US options, she turned to Canada to continue her career, where immigration rules remain clearer. This case reflects a larger trend of Iranian academics moving to Canada or Europe or pausing their projects. Experts say cutting high-skilled immigrant scientists undermines US innovation in fields like biotechnology and AI. While supporters call the ban a security measure, the harsh approach faces less public outcry than the 2017 ban did. Pouyabahar describes the visa limbo as mentally taxing, with constant fear of policy shifts and grant losses. She feels "reluctant relief" for avoiding entry into a system where immigration status can be revoked suddenly. This experience changes how many scientists view the US as a place to build their careers.