Before his consecration as bishop of the Evangelical Lutheran Church in Jordan and the Holy Land, Azar was a pastor in Jerusalem's Old City for three decades.
Walker was "a legend in his own right," said the current president of the Southern Christian Leadership Conference, which Walker also led.
He is best known for his 1984 book The Nature of Doctrine and his engagement in the ecumenical movement.
Ellen Johnson Sirleaf handed over power in the West African nation's first peaceful transition in decades.
The executive minister of justice and witness ministries was named 2017 Person of the Year.
Smith raised fundamental questions about the nature of religion.
“He was a tireless advocate of racial and gender justice in the church,” a colleague said, “often at great cost to his own career.”
“He feels he can make a difference, and I think he can,” said a fellow member of Covenant United Methodist Church.