File:Derek Parfit at Harvard-April 21, 2015-Effective Altruism (cropped).jpg

Harvard Square, Harvard University, April 21, 2015 I, the copyright holder of this work, hereby publish it under the following license: This file is licensed

Harvard Square, Harvard University, April 21, 2015 I, the copyright holder of this work, hereby publish it under the following license: This file is licensed