Known for his conceptual art and social activism in Argentine politics, most of his work is collaborative such as his displays in Experiencias and participation in Tucumán Arde.

He would later write a book, though it currently remains unpublished- Storming Heaven (El asalto al cielo)- containing information about the research he did on those.

In a piece that would later be seen as crucial in Jacoby's conceptualist works, he published his essay Against the Happening which called into question the reliability of media narrative.

The exhibition consisted of a group of artists spreading knowledge and insight into the misfortunes and social injustices which threatened the Argentine public at the time.

Due to the controversial nature of the exhibition, shortly after it began, many of the works were removed or destroyed in order to protect the identities of those who participated.

During gathering in Central Park, Jacoby pinned photographs of Mao Zedong and of Juan Perón (who the Argentine Left believed would lead a socialist revolution upon his return from exile) to his chest.

Based on a school rally chant, Jacoby's title joins the two historical figures through rhyme, seemingly mocking the 'surety' of Perón's adherence to Leftist ideologies.

In three parts, this work consisted of a manifesto poster, a teletype receiving real-time news from France in May 1968, and a photograph of an anti-war protester.

The work was meant to emphasize Jacoby's belief that the action and ideas, not the medium, of political art was important.

An awareness campaign done in collaboration with Mariana "Kiwi" Sainz, "I have AIDS" was something of a performance piece which consisted of celebrities such as the singer Andres Calamaro wearing printed shirts with this phrase on it.