Aim 1. Determine the safety and therapeutic efficacy of left-sided DLPFC high frequency rTMS on MDD symptoms in patients with ASD: The investigators hypothesize that patients receiving the rTMS will tolerate the treatment course without difficulty and have clinically significant reduction of depressive symptoms after receiving all 25 sessions, as compared with their symptom burden prior to initiating TMS. Depression symptom data will be collected as pre- and post-TMS scores on Hamilton Depression Rating Scale (HAM-D). Depression scores will also be monitored periodically during course of TMS with Patient Health Questionnaires (PHQ-9).