ラテンアメリカ研究
After his return from the Netherlands, he worked for three years as a policy analyst at the United States State Department for three years. In 1957 he was appointed as chairman to the history department as the University of New Mexico. Lieuwen found himself in an academic circle that included France Vinton Scholes as the authority on Latin American studies. His work established the Latin American studies program which would later become the Latin American Institute.