Simon Sinek is a British motivational speaker/ author and all round interesting guy. I found out about him when his video on Millennials was heavily trending on YouTube, a truely insightful talk about the clash between generations in the workplace. His perspective and understanding on business's, leaders and people is intriguing and I actively search for his content. I have read both "Start with the why" and Leaders eat last" both are great.
Be sure to check out his channel