Mark Hagen 
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Seminar: Bristol Junior Geometry Seminar. Bristol Geometry & Topology Seminar. Signed: May 2021: I have signed the Just Mathematics Collective statement on collaboration with the NSA. Some signatories were sent this response (pdf) from the American Mathematical Society. Letter to AMS Notices responding to the response. June 2020: I have signed the boycott of mathematical collaboration with police. 