For a few years he was assistant professor of tax law, while also working as a lawyer at the Minister of Finance. At the same time he was in participated of the 1964 election that was won by his uncle. After the 1973 Chilean coup d'état, he retired from politics and dedicated himself to private practice, and also to running the "Irene Frei Montalva" foundation, which provided free daycare for children of poor families.