The brewer who took over Spaten Brewery in Munich when his father, Gabriel Sedlmayr the Elder, died in 1839.
Under Gabriel Sedlmayr the Younger, Spaten was on the forefront of brewery innovation. In 1844, Spaten became the first brewery outside of England to use steam power. In 1873, Spaten also became the first brewery to install a then-cutting edge refrigeration system.
The refrigeration system allowed Spaten to become the largest brewery in Munich. In 1894, Spaten introduced a new, straw blond beer, which later became known as a Helles.