Bob Arum believes Muhammad Ali was as important a public figure as anyone in the 20th century. The Hall of Fame boxing promoter says that ranking Ali in the top 10 among influential people - in all walks of life, not just sports - is "too conservative."
"In the history books, when you look at the top three, Ali will be one," Arum says. "He not only had a tremendous impact in the United States with his stand on civil rights, but all over the world he was the most recognizable figure.
"Franklin Roosevelt, Winston Churchill, Martin Luther King - Ali may have had the most impact of anybody."
The Rev. Jesse Jackson says Nation of Islam leader Louis Farrakhan attended the Muslim prayer service for Ali.
Thursday's service was attended by Ali's family and thousands of Muslims and fans of the boxing champion, who died last Friday at the age of 74.
Ali joined the Nation of Islam and changed his name from Cassius Clay as a young man. He later parted ways with the group, embracing mainstream Islam.
Jackson confirmed that Farrakhan attended the service and said he had a chance to chat with Farrakhan.
"The Nation of Islam played a big role in the early religious disciplines in Muhammad Ali - his sense of sacrifice, his values," Jackson said. "Yet he did not limit himself to one religion. ... He always had a chance of humanity that was not limited to one religion."