Jacob Kowalski was a Polish-born American No-Maj, who lived at 435 Rivington Street New York during the 1920s. Jacob fought in the First World War. Returning home to the United States he found work in a cannery, but dreamt of becoming a baker. On 5 December 1926, he went to Steen National Bank to apply for a loan of $2300,[1] but was turned down.
While at the bank he met Newt Scamander, a British wizard who stopped in New York City on his travels to find and document magicalbeasts. Through Newt he was exposed to the magical world, but had his memories wiped as was required by wizarding law.
As last known, Jacob owned a very successful bakery subconsciously inspired by his experiences with Newt Scamander's beasts.