The "presence" of a leader

Is being present a leadership skill? Can being present determine the outcome of a meeting? I recently met with someone who was interested in doing business with a new company I had just started. It took several weeks to arrange the meeting and I was looking forward to tell him all about this new project and establishing a relationship that could be beneficial for my new company. I arrived early and waited in the parking lot rehearsing my “pitch” knowing that everything I said could make a difference in the outcome of the meeting. I reminded myself to be calm and present and did a brief breathing exercise to bring me back to the present moment. At the scheduled time I went inside. I was ready