She served as a full professor, dean, and vice-dean of the Faculty of Natural Sciences and Museum (FCNyM) of the National University of La Plata (UNLP).
[2] Oyhenart was a member of the National Scientific and Technical Research Council (CONICET), working at the Instituto de Genética Veterinaria “Ingeniero Fernando Noel Dulout” (IGEVET).
Within the field of experimental anthropology, her main line of research was the study of growth, development, and nutritional status in the infant population.
Oyhenart taught at UNLP's Faculty of Medical Sciences (FCM) and the FCNyM, as well as at the National University of Central Buenos Aires (UNICEN).She held numerous positions in her academic life.
Oyhenart played an important role in training others in her area of expertise, directing several doctoral theses and undergraduate dissertations.