Who is Mojtaba Khamenei, son and successor to Iran's supreme leader?

Iran's Assembly of Experts has named Mojtaba Khamenei to succeed his slain father Ali Khamenei as the country's supreme leader, signalling that hardliners remain firmly in charge in Tehran more than a week into its conflict with the United States and Israel. 

Who is Mojtaba Khamenei, son and successor to Iran's supreme leader?
Iran's Assembly of Experts has named Mojtaba Khamenei to succeed his slain father Ali Khamenei as the country's supreme leader, signalling that hardliners remain firmly in charge in Tehran more than a week into its conflict with the United States and Israel.