He learned to use a pistol at age 9 and he was first known in the national sporting scene in 1976[1] when he became the junior champion of the rapid fire, center fire and standard pistol events at the Benito Juarez World Shooting Championships which was hosted in Mexico City.

[3] He did not win any gold medal in the regional tournament for 16 years until he won at the rapid fire event at the 2009 Southeast Asian Games in Laos.

[1] He did not participate in the 1999 and 2013 Southeast Asian Games due to the non-contest of rapid fire pistol event in those two editions.

[1] His father was Olympic shooter Tom Ong[4] and his siblings are Carolina, Kristine, Rose, Donald, and Jeffrey.

[citation needed] He is also the general manager of Spring Cooking Oil, his family's business.