Joseph Muzquiz was a Spanish Catholic priest and a pioneering member of Opus Dei who dedicated his life to expanding the movement's presence internationally. Born in 1912 in Badajoz, he pursued diverse academic interests, eventually earning doctorates in civil engineering, history, and canon law. After joining the movement in 1940, he played a vital role in establishing its foundations across the United States, Canada, Japan, and Venezuela. He died in 1983 in Plymouth, Massachusetts, following a sudden heart attack during a teaching session.