Alexander Heffner, host of 'The Open Mind,' speaks at UNM By Karen Wentworth April 22, 2015 Alexander Heffner, host of “The Open Mind” on PBS, comes to the University of New Mexico on April 30. His topic, scheduled for the Willard Room in Zimmerman Library at 5:30 p.m. will be on “Millennials, Media and the Future of Civil Discourse.”