From the Jamestown Foundation: The Man in Nasrallah's Shadow: A Profile of Sheikh Naim Qasim
Sheikh Naim Qasim, the deputy secretary-general of Hezbollah, is one of the most interesting politicians in Lebanon. He is also one of the most under-covered by the Western media because he remains overshadowed by the towering influence of his boss, the charismatic 46-year-old Sheikh Hassan Nasrallah. Yet the life and career of the number two man in Hezbollah is important since he is the leader who would likely lead the controversial party if Nasrallah were to step down or get killed by Israel...
Additional insights into the man and his perspectives on the organization can be gained from his book, "Hizbullah: The Story from Within".