A recent report from the Institute of Medicine states that an estimated 5% of all service members in the Military Health System and 8% of those who served in Iraq or Afghanistan have been diagnosed with Posttraumatic Stress Disorder, or PTSD, an anxiety disorder developed after exposure to traumatic events. An accurate, non-intrusive tool that remotely monitors and screens soldiers’ mental health status would be helpful to determine which warfighters require psychological rehabilitation. IAI and its collaborators at The Old Dominion University and the University of Utah are developing TPM, a voice-based Tele-PTSD Monitor that can remotely screen for stress, monitor patients, and provide assistance to clinicians in assessing a PTSD patient's condition. IAI's ListEn will act as the brain of the TPM, processing voice data, extracting different types of salient features, and accurately computing PTSD scores. ListEn relies on the user’s voice for remote PTSD monitoring and does not require costly video conferencing facilities nor cumbersome physiological sensors. In the program, IAI will improve the accuracy of the TPM by incorporating the latest machine learning algorithms and conducting a large scale validation using voice data collected from over 200 participants at the National Center for Veterans in Fort Carson, CO. ListEn and the TPM prototype mobile app will provide remote monitoring and diagnosis of mental health for military and civilian applications.