[3] Between 1945 and 1947, Makari was a British Council scholar at the Royal College of Physicians & Surgeons in England.
Beginning in 1947, Makari served as a senior physician and director of the hospital laboratory to the Trans-Arabian Pipeline Hospital in Beirut, Lebanon,[3] where he pursued research into subject matters including intradermal testing for infectious diseases like malaria and hepatitis.
He then moved to the University of Texas, where from 1954 to 1956 he was an associate professor of immunology, while also working as an immunologist at the M. D. Anderson Hospital & Tumor Institute.
From that point forward he worked as the director of the Makari Research Laboratories located in New Jersey.
In 1965, a five-year preliminary study of the Skin Tumor Test was presented at the New York Academy of Sciences.