How did Emile Hansen's pure yeast cultures affect lager brewing?

Emile Christian Hansen revolutionized the brewing industry by developing a method to cultivate pure strains of yeast free from contaminating bacteria or other yeast species.12

Before this innovation, brewers relied on inconsistent yeast populations, which often led to unpredictable fermentation results. Hansen’s discovery allowed for precise control over the fermentation process, ensuring consistency and quality in the final product.1

His pure-culture technology was rapidly adopted by Continental lager brewers, who utilized these specific bottom-fermenting strains to standardize their production. This advancement was instrumental in the global rise of German-style lagers, which became the dominant beer style in the Americas. While Continental brewers embraced these methods in the late 19th century, British ale brewers did not widely adopt pure-culture techniques until the 20th century.12