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Joseph Muzquiz (1912-1983) was a Spanish priest who was an early member of Opus Dei. He worked to establish the movement around the world. The cause for his canonization was opened by the Roman Catholic Archdiocese of Boston, where he died.
He was born José Luis Múzquiz y de Miguel in Badajoz, Spain, on 14 October 1912. He went to Madrid to study engineering and it was there that he met Josemaría Escrivá, the future founder of the Opus Dei movement. He joined the Nationalist army during the Spanish Civil War when his city was occupied by Nationalist forces. After the war, he was admitted to the newly founded Opus Dei in January 1940.
Muzquiz continued in his profession, working on the reconstruction of the infrastructure of the nation, building bridges around the country. He went on to earn three doctorates in total: in civil engineering, history and in canon law. He lived out his religious commitment through evangelization among his friends and colleagues.
He was one of the first three members of Opus Dei to be ordained to the priesthood on 25 June 1944. He was sent to the United States in 1949, where he helped establish Opus Dei centers in Chicago and Washington, D.C. He also laid the foundations for Opus Dei's work in Canada, Japan and Venezuela. During the 1960s and 1970s he worked in Europe and Asia and pressed for the canonization of the organization's founder.
He returned to the United States in 1976, settling at Arnold Hall Conference Center, an Opus Dei apostolate based in Pembroke, Massachusetts. On 20 June 1983 he suffered a heart attack while teaching a class there, and died the following day at Jordan Hospital in Plymouth. His funeral was held at the former St. Aidan's Church in Brookline and he was buried at St. Joseph's Cemetery in West Roxbury.