Final answer:
Mawlana Hazar Imam Shah Karim al-Hussaini Aga Khan IV is the Founder and Chairman of the AKDN. In Shia Islam, legitimate caliphs had to be descended from Ali, who is revered as the first Imam and central to Shia beliefs.
Step-by-step explanation:
The Founder and Chairman of the Aga Khan Development Network (AKDN) is Mawlana Hazar Imam Shah Karim al-Hussaini Aga Khan IV. The AKDN is a group of private, non-denominational development agencies that work to improve living conditions and opportunities for people in some of the world's most challenged regions. The legitimate caliphs in Shia Islam had to be descended from an early figure in Islamic history, Ali, who is considered the origin of the direct line of succession for Imams. Ali was also the fourth ruler among the Rightly Guided Caliphs, following the death of Prophet Muhammad. He is highly regarded in Islam for being the first person to accept and follow Muhammad's words and is central to Shia Islamic belief as the first legitimate imam, from whom all subsequent Shia Imams descend.