The freezer was invented in 1876 by Carl von Linden, a German engineer. However, his invention was based on the work of earlier experiments with refrigeration technology.
The first person to use artificially manufactured ice for food preservation was James Harrison in 1857. His applications were meat packing and brewing.
In 1859, Ferdinand Carre adapted the original design to use ammonia, rather than air.
Carl von Linden's contribution was to establish the process of liquefying gas. In 1927, General Electric released the new technology to the public.
Prior to the invention of the freezer, people used snow and ice to preserve their food.