Dieffenbacher has held several leadership positions within the School of Fashion - most recently she was Program Director, BFA Fashion Design (2011-18), where she successfully led the BFA program though the development and implementation of the new curriculum that embraces progressive modes of teaching inclusive, universal approaches to design for the twenty-first century. From 2007-11, Dieffenbacher held the position of Director of External Partnerships, where she managed a large range of projects including Coach, Louis Vuitton, Swarovski, Henri Bendel and LVMH.