The founder's son, Henry Pierre Heineken (nl), managed the company from 1917 to 1940, and continued involvement with the company until 1951. During his tenure, Heineken developed techniques to maintain consistent beer quality during large-scale production.
After World War I, the company focused more and more on export. Three days after Prohibition ended in the United States, the first Heineken shipment landed in New York. From that day on, Heineken has remained one of the most successful imported beer brands in the United States.