Jaski, Y. Welcome and Overview of the Conference JACoW Publishing Geneva, Switzerland Stephen Streiffer (Deputy Laboratory Director for Science & Technology and Interim Associate Laboratory Director for the Photon Sciences Directorate) and Yifei Jaski (MEDSI2020 Conference Chair) welcome you to the 11th International Conference on Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation (MEDSI2020).