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In page Covid Watch:

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As the pandemic began its outbreak in North America, on February 19, 2020, Stanford University PhD candidate and DOE CSGF Fellow Tina White made a public Effective Altruism (EA) forum post about researching smartphone technology like GPS to alert people privately of COVID-19 exposure.[1] This post got the attention of James Petrie at University of Waterloo who had started writing an academic paper on Overleaf on February 7, 2020, exploring private, decentralized methods using MAC addresses.[2] The two researchers began the research collaboration between Stanford and Waterloo, which formed into the nonprofit Covid Watch.[citation needed]