Prince Karim Aga Khan IV, born on December 13, 1936, is the 49th Imam of the Nizari Ismaili branch of Shia Islam. He succeeded his grandfather, Aga Khan III, in 1957 and has since played a significant role in promoting the welfare of his followers and communities around the world. As a philanthropist, the Aga Khan has established various institutions, including the Aga Khan Development Network, which focuses on health, education, and economic development. He is also known for his efforts in promoting cultural pluralism and improving the quality of life in developing countries.