 He became spiritual director of St. Rochus Hospital at Mainz in 1845, and pastor at Abenheim near Worms in 1847.On 21 June 1852, he was appointed director of the Hessian Catholic teachers' training college at Bensheim.During the fifteen years of his administration, encouraged by Bishop von Ketteler, Ohler laboured to infuse a better spirit into the Catholic teaching body of Hesse.