[1] He went to college in Havana where he learned about the impact of American interference in Cuban affairs and he became deeply involved in the socialist revolution to oust the current government.

After the unexpected death of Miguel Ángel Fernández in 1945, Ruz Lhuillier took charge of the INAH's investigations at Palenque.

While he served as the INAH's southern Director of Pre-Hispanic Monuments, Ruz Lhuillier excavated much of the city and restored and conserved such edifices as the Palace.

In 1948, he discovered the entrance to the tomb of the Maya ruler, K'inich Janaab' Pakal, hidden beneath the Temple of the Inscriptions.

Honoring his works, the Mexican Government permits that his remains rest in peace in front of the Necropolis that was discovered by him at the Maya site of Palenque, Chiapas.