On 15 October 1708 he ended his academic education, and probably moved to the Jesuit school in Landsberg am Lech for his novitiate.

In 1717 he moved to the Jesuit College of Ingolstadt for continued theological studies and was officially accepted into the Society of Jesus.

[2] After the death of Eusebio Kino in 1711 a growing number of German-speaking Jesuit missionaries were sent to the Sonora region.

After a long and difficult journey with several lengthy delays, traveling via Genoa, Cádiz, Seville, Santo Domingo and Havana, he finally reached Veracruz on 19 April 1731.

He died on 28 September 1762 in Ures at a time when his mission was suffering severe damage from attacks by Apaches and Seris.

They give valuable information about the local people and their lifestyle, including their beliefs, culture and way of life.

[3] Segesser's letters also requested seeds for crops like flax, beets, cauliflower, fennel, garlic, and celery.