Elon Musk. He possesses referent power. The followers that work for him are proud to do so, and share his core value of using technology for the betterment of the world. Referent power comes from being trusted or respected, for example, the boss who treats everyone fairly and with respect.
Dr. William A. Abdu. He possesses expert power. Expert power comes from one’s experience or knowledge, for example, a senior surgeon displays the expert knowledge for subordinates to trust them.