In 1822 he professed his vows and was ordained a priest on September 24, 1825. After ordination, he worked as a
chaplain in
Luzern, then as novice master and teacher of theology at
Fribourg until 1830. In 1839, he was sent to Solothurn to teach philosophy. During his teaching days, he started to feel a strong desire to go to the overseas missions. Permission was granted him to go as a missionary only after much hesitation from his superiors. In September 1841, Hartmann left
Switzerland and traveled to
Rome on foot. In 1843, he was chosen to go with the Mission to
Agra in
India. After five months, he was reassigned to head the mission station in the town of Gwalior, in what is now
Madhya Pradesh. == Episcopate ==