Joseph Lescrauwaet was coadjutor bishop of Haarlem. After studying theology and philosophy, he was ordained as a priest in 1948 and gained a PhD in ecumenical theology in 1957. His interest in ecumenism is also visible in publications such as De bijbel over de Christelijke eenheid (1961) and De actuele oecumenische situatie (1962). Lescrauwaet was Professor of Systematic Theology in Tilburg and Leuven. He was named coadjutor bishop of Haarlem in 1983, remaining there until his retirement in 1995.