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Like Nasrallah, Kassem is one of the founding members of the Shiite political party and armed group, but he is widely seen as lacking the former leader’s charisma and oratory skills.

Still, the white-turbaned cleric with a gray beard has often been the . After Nasrallah went underground out of fear of being assassinated by Israel, appearing only in televised speeches, Kassem continued to show up at rallies and ceremonies, and he has sat for .

Mohanad Hage Ali, a senior fellow at the Carnegie Middle East Center think tank who researches Hezbollah, said that Kassem is perceived by many as “more extreme” than Nasrallah, at least in his public statements.

In practice, however, his power within the group was limited under Nasrallah. Hashem Safieddine, a cousin of Nasrallah who oversees the group’s political affairs — not Kassem — was generally regarded as the leader's heir apparent. But no announcement has been made, and Safieddine has not appeared publicly or made any public statements since Nasrallah’s death.

Kassem has been sanctioned by the United States, which considers Hezbollah a terrorist group.

He was born in the town of Kfar Fila in southern Lebanon and studied chemistry at the Lebanese University before working for several years as a chemistry teacher.

At the same time, he pursued religious studies and participated in founding the Lebanese Union for Muslim Students, an organization that aimed to promote religious adherence among students.

In the 1970s, Kassem joined the Movement of the Dispossessed, a political organization founded by Imam Moussa Sadr that pushed for greater representation for Lebanon’s historically overlooked and impoverished Shiite community. The group morphed into the Amal movement, one of the main armed groups in Lebanon’s civil war, and now a powerful political party.

He then joined the nascent Hezbollah, formed with support from Iran after Israel invaded Lebanon in 1982 and occupied the country’s southern region.

From 1991, he served as deputy secretary-general of the group, initially under Nasrallah’s predecessor, Abbas Mousawi, who was killed by an Israeli helicopter attack in 1992.