Stein, who was the bastion of modernism in Paris, became Hemingway's mentor and godmother to his son Jack; she introduced him to the expatriate artists and writers of the Montparnasse Quarter, whom she referred to as the "Lost Generation"—a term Hemingway popularized with the publication of The Sun Also Rises.
Stein, i cili ishte bastion i modernizmit në Paris, u bë mentor i Hemingway dhe ndeja për djalin e tij Jack, ajo e prezantoi atë me artistët dhe shkrimtarët e emigrantëve të lagjes Montparnasse, të cilës i referohej si "Gjenerimi i Humbur "- një term Hemingway i popullarizuar me botimin e The Sun also Rises.