[1][2] In 1955, he moved to Mérida and worked as a professor of Ancient Greek and philosophy from 1955 to 1962 at the University of the Andes, Venezuela.
[8] In 1968, he published a critical edition of Hippolytus' "Refutation of All Heresies",[9] in which he revised the text published at the beginning of the century by Paul Wendland and for the first time welcomed unpublished conjectures by Hermann Fränkel, that certain passages in the codex unicus of Hippolytus' text are displaced.
[13] Starting from his time in Cambridge, he became increasingly interested in Greek philosophy and Christianity, contributing to the Pauly-Wissowa with a monographic article on Heraclitus (1965) and editing, as mentioned before, Hippolytus' treatise "Refutation of All Heresies" (1968).
He remained prolific in his late years after retirement, producing a series of critical editions, mainly of Christian authors: Prosper of Aquitaine ("De providentia Dei", 1989), Athenagoras of Athens ("Legatio pro Christianis", 1990; "De resurrectione mortuorum" [sp.
[1][16] At the beginning of his career, Marcovich also worked as a translator from German and Russian to Serbo-Croatian and published some textbooks (including Engels' The Evolution of Socialism).
[2] When he passed away, scholars Howard Jacobson[17] and David Sansone published obituaries in his honor,[2] and so did Fernando Báez, adding one in the reprint of Marcovich's edition of the Bhagavad-Gītā.
Marcovich wrote his own epitaph in English, which scholars translated in several languages including Ancient Greek and Latin (J. K. Newman), Hebrew (Howard Jacobson), Sahidic Coptic and Sanskrit (Gerald M. Browne) and Syriac (Sebastian Brock).