His thesis about the effects of isoproterenol on myocardium was published in Am Heart J in 1976 and has been extensively cited as well as his investigations in the '80 in NIH, National Heart, Lung and Blood Institute, USA under the guidance of his mentor, Victor Ferrans. As a member of the Argentine Society of Cardiology from 1975, he has developed an extensive societary activity. Professor Milei is the Chairman of the Module of Cardiology and Hypertension at the Argentine Medical Association devoted to South American general practitioners´ training. His research on Chagas' cardiomyopathy substantially contributed to the knowledge of its pathophysiology and his work on early atherosclerotic lesions helped set up the basis for the importance of intimal thickenings in plaque genesis. He has authored over 140 papers in peer reviewed journals, 4 books and over 10 invited chapters in books on cardiology. He is a scientific advisor to the University of Buenos Aires and the Director of the Doctoral Department of the Northwest University in Argentina. His work on Chagas' disease has been a reference book in the last 20 years.