Zubero was born in the United States, swam in international competition for Spain, and holds dual Spanish-American citizenship.

[3][4] David Zubero is the older brother of the 1992 Olympic champion in the 200-meter backstroke, Martin López-Zubero.

[5] He also swam in the 1984 Summer Olympics in Los Angeles, tying for twelfth in the 100-meter butterfly and also swimming for the eleventh-place Spanish men's team in the 4x100-meter freestyle relay.

[5] Zubero served as an assistant coach under Ralph Crocker and Gary Butts for the Pine Crest School in Fort Lauderdale, Florida in the 1990s.

He earned a master's degree in science education from Nova Southeastern University in Broward County, Florida.