Before coming to the United States, Nebres studied fine arts in the Philippines and worked in the Filipino comics industry for such publishers as Bulaklak Publishing,[4] ACE Publications, and Graphic Arts Service (GASI).

[7] From 1973–1977, Nebres was a part of fellow Filipino cartoonist Tony DeZuniga's studio[1] and emigrated to the United States in 1975.

[8][9] Nebres later drew Doctor Strange, John Carter, Warlord of Mars, Marvel Super Special, and Power Man and Iron Fist and contributed to Marvel's black-and-white magazine line, Curtis Magazines, most notably on Deadly Hands of Kung Fu.

[4] From 1980–1983, he drew stories for Warren Publishing's Creepy, Eerie, Vampirella, and 1984 titles.

[5] Nebres then focused on storyboards and commercial art and largely left the comics industry.