John Berthier was a French Catholic priest and missionary born in Châtonnay in 1840. After joining the Missionaries of La Salette and being ordained in 1862, he dedicated his life to religious education and spiritual formation. He is most recognized for establishing a religious institute in Grave, Netherlands, specifically designed to assist men who felt called to the priesthood later in life. His theological writings focused on achieving holiness by following the example of the Holy Family.