[1][2][3] Zimmermann was born in Birmenstorf, Aargau, Switzerland,[4] and attended the College du Christ-Roi in Nuolen.
[5] A member of the Missionaries of the Holy Family [de; fr], he made his first vows in 1945 and was ordained to the priesthood in 1950.
[8][9] In 1960, Pope John XXIII created the Roman Catholic Diocese of Morombe and named Zimmermann its bishop.
[10] Zimmermann was the first Swiss member of the Missionaries of the Holy Family to be made bishop.
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