Doctoral Candidate Jonathan Purtle Selected For International Society for Traumatic Stress Studies Student Award December 23, 2013 Jonathan Purtle, a DrPH Candidate in Drexel University School of Public Health's Health Policy and Social Justice department, was selected as the 2013 ISTSS Outstanding Student Advocacy and Service Award winner. The Award for the Outstanding Student Advocacy and Service is designed to recognize a graduate student member of ISTSS who has made a significant contribution in the field of public advocacy, clinical work, and traumatic stress at a local, national, and/or international level.