He did a zoology fellowship in Naples, Italy for two years before heading to Zurich, Switzerland to do further genetic studies.
In 1949 he went to Indiana University as a research associate with Salvador Luria and began deeper studies into lysogeny.
After his research group moved their lab to Illinois, he met Elizabeth Teegarden who eventually became his wife.
In 1954 he transferred to Caltech to continue his research with Max Delbruch and in 1957 he became a medical school professor at the University of Southern California, in Los Angeles.
Through this network he eventually met Salvador Luria, a professor at Indiana university, and joined him as a research associate.
[3] In 1953, Bertani was one of the first scientists to describe host controlled variation alongside his colleague Salvador Luria.