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United States (US) immigration policies have increasingly focused on national security resulting in universities experiencing declines in international student applications, constraints on international scholar employment, and complications facilitating international research collaborations. The COVID-19 pandemic brought additional travel restrictions, embassy closures, and health and safety concerns that exacerbated these challenges. Science mobility is critical for science education, training, competitiveness, and innovation. Using a representative sample of US and foreign-born scientists in three STEM fields, we explore how recent visa and immigration policies have shaped research collaborations, work with students and postdoctoral scholars, and intentions to leave. We use descriptive statistics, analysis of variance, and logistic regression and find academic scientists report disruptions from visa and immigration policies; negative impacts of immigration policies on US higher education; negative effects on recruitment and retention of international trainees; and increased intentions to leave the US driven by negative perceptions of immigration policy., Supplementary Information: The online version contains supplementary material available at 10.1007/s11162-023-09731-0., Competing Interests: Competing interestsThe authors declare no competing interests., (© The Author(s), under exclusive licence to Springer Nature B.V. 2023, Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.)

Survey alert letters improve response rates and assure potential respondents that the research is legitimate and of high quality. Pre-notification by mail increases response rates for web surveys because it represents a second mode of communication and contributes to increases in respondent trust and study legitimacy. Due to work-from-home orders in response to COVID-19, postal alert letters are unlikely to reach research participants at their place of employment. We conducted three experiments testing the effects of sending academic scientists a pre-notification email message on web survey response rates as compared to no alert email message and variation in the timing of the pre-notification. The data comes from three random national samples of university-based scientists that were conducted during the early months of the COVID-19 pandemic. Two of three experiments suggest that email alert pre-notifications can have a minor effect on improving response rates to web surveys of academic scientists. The timing of those pre-notification messages, though, had no effect on survey response. These findings indicate pre-notification messages remain useful when studying academic scientists. Future research should compare the effects of electronic as compared to postal pre-notification on survey response among scientists, as postal pre-notification requires extensive resources., Competing Interests: Conflicts of interestThe authors have no relevant financial or non-financial interests to disclose., (© Akadémiai Kiadó, Budapest, Hungary 2021.)