The first concrete step was accomplished with his founding of the Sisters of Our Lady of Sion in 1847, the first members being two Jewish sisters who converted to Catholicism and committed themselves to the education of Jewish children in a Christian setting. Not long after Alphonse's ordination in 1850 as a Jesuit priest, he left his Order to join his brother in their shared vision. In 1852 Theodore and Alphonse led the small community of men who had gathered to share in the work to form a new congregation, the male branch of the Congregation of Our Lady of Sion.