Besides Gebhard Schädler, he was the only academically trained doctor in Liechtenstein at the time and he often treated many of his sick patients free of charge.

[1] Grass was a prominent proponent of the expansion of education in Liechtenstein and donated a considerable amount of his wealth towards this goal.

[1] In 1857, he donated 20,000 Guilders (approximately 450,000 Swiss francs today)[3] in order to fund the building of a state high school in Vaduz, which was opened in 1858.

He supported the liberal ideas against the absolute monarchy of Aloys II and the movement by Peter Kaiser, which led to the 1848 Liechtenstein revolution.

[1] Several commemorative plaques at the cemetery of Vaduz praise his character and his commitment to give medical healing and to spread knowledge through education.