The Ismailis are now under the leadership of Aga Khan V, their Imam. Below is about their previous Imam, Aga Khan IV, Imam Shah Karim al-Husayni.
Aga Khan IV at Harvard.
About the Ismailis.
Aga Khan IV spent much of early years in Nairobi, Kenya, and then studied in Switzerland. He obtained a B.A. in Islamic Studies at Harvard in 1959.
Aga Khan IV, the 49th Imam of the Ismailis visited his communities in many parts of the world. The Aga Khan Foundation has done much charities towards development of the Ismailis and others.
Source: Farhad Daftary and Zulfikar Hirji. 2008. The Ismailis: An Illustrated History. Azimuth Editions, London 262pp