I'm a huge fan of Simon Sinek and this is a very inspiring (albeit long at 30 mins) talk. The reason why I do what I do (in reference to his "Golden Circle") is that I believe that technology can help make the world a better place for everyone and advance the human race – Including the use of technology in advertising and communications to shape and change human behaviors. In this talk, Simon talks about the need for trust in all relationships and how human bonds are formed when people find themselves within a circle of trust. This same mantra can be applied to organizations as well. It's awe-inspiring as a motivational talk but also extremely relevant and insightful to the field of communications.