They trained under former Ceylon flyweight champion Henry Young, who thought Ronnie could become an Olympic boxer.

[4] He worked as a columnist for the sports section of the Manila Standard-Today and Philippine Daily Inquirer newspapers.

[1] In 1975, Nathanielsz was appointed by then-President Marcos as a liaison officer between the Philippine government and the organizers of the Thrilla in Manila boxing match (Muhammad Ali vs. Joe Frazier).

[2] A few years later, he became the news director and general manager of the Maharlika Broadcasting System, the former brand of Channel 4.

He was then brought to the intensive care unit of the Mills-Peninsula Medical Centers in Burlingame, California.