[1] In the position he commissioned his brother Alejandro Bustillo among others to design build-up the city of Bariloche as a centre for tourism.

In his development plans Bustillo was inspired in Hubert Lyautey's administration of French Morocco.

[1] Especially through his autobiographical writing El despertar de Bariloche (first edition from 1968), which Bustillo had written on the basis of his private archive, and which is now in the Archivo General de la Nación, Exequiel Bustillo successfully made a name for himself as the actual creator of the national parks.

Bustillo, who was deeply rooted in the aristocratic oligarchy of Buenos Aires, presented the earlier park initiatives of Francisco Pascasio Moreno, Carlos Thays and Bailey Willis - while concealing the works of Carl Curt Hosseus and Lucíen Hauman.

But despite this eulogy on Frey, Bustillo conceals that Frey was not only an official of the Dirección de Tierras at that time, but in this function the official director of the National Park del Sud, established in 1922 and that in this capacity he had carried out various works to set up the park and improve its infrastructure.