Marcovich focused his scholarship on textual criticism of philosophical and religious texts, mainly in Greek. He edited
Heraclitus' fragments twice during his time in
Cambridge, in 1967 (
editio maior) and 1968 (
editio minor); the former, he also translated in Italian in 1968 and has been reprinted without alterations in 2017. A prolific author, he published two collections of papers on ancient philosophy and religion—in 1965 and 1988. He had an uncommon breath of interests. At the beginning of his career, he edited the
Davidiad by
Marko Marulić (1957) and the Latin poems by Dalmatian poet and humanist Franjo Božičević (1958), both in first edition, and translated (in Spanish) and commented the
Bhagavad-Gītā, one of the holy scriptures of
Hinduism (1958). In 1968, he published a critical edition of
Hippolytus' "
Refutation of All Heresies", 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Paul Wendland and for the first time welcomed unpublished conjectures by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. In 1984 he published a monograph on Greek tragic trimeter, and some years later two collection of studies on Greek poetry (1991 – a second one in 2002) and on textual criticism of Patristic texts (1994). 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.], 2000),
Justin the Martyr ("Cohortatio ad Graecos", "De monarchia" and "Oratio ad Graecos" [all sp.], 1990; "Apologiae pro Christianis", 1994; "Dialogus cum Tryphone", 1997),
Tatian ("Oratio ad Graecos", 1995),
Theophilus of Antioch ("Ad Autolycum", 1995),
Origen ("
Contra Celsum", 2001) and
Clement of Alexandria (“
Protrepticus”, 1995; "
Paedagogus", 2002 [published posthumously]). At the same time, he edited and commented the
Alcestis Barcinoensis (1988) and produced three
Teubner editions:
Theodore Prodromos' "De Rhodante et Dosiclis amoribus" (1992),
Diogenes Laërtius' "
Lives and Opinions of Eminent Philosophers" (2-volumes set, 1999, which included unpublished Byzantine paraphrases; Hans Gärtner edited a volume of indexes in 2002) and
Eustathios Makrembolites' "De Hysmines et Hysminiae amoribus libri XI" (2001 [published posthumously]). During his lifetime, Marcovich wrote and edited more than 30 books (not including the various issues of
Illinois Classical Studies) and wrote 253 articles and essays in Spanish, German, Latin, Italian, French and
Serbo-Croatian. 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).
Honours Marcovich received an honorary doctorate degree in humanities from the University of Illinois in 1994; two
Festschriften were published as monographic issues of the journal he founded,
Illinois Classical Studies: • • Other honors include the Silver Cross of
Mount Athos (1963), a
Guggenheim Fellowship (1983), a National Endowment of the Humanities Fellowship (1990) and an Albert Einstein Visiting Fellowship by the
Israel Academy of Sciences (1993). and David Sansone published obituaries in his honor, 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). ==Personal==