In 1908 she became Professor of Economics at Wellesley. In 1909, Youngman published
The Economic Causes of Great Wealth, based on her doctoral dissertation by the same title
. In it she contests the idea that such fortunes could be earned, outlining factors outside of personal ability that contribute to the amassing of wealth. A favorable review in
The New York Times said, "Dr. Youngman may take her seat beside
Ida Tarbell, who knows how to impress herself upon her times even without voting." She and Bett Hooper were the paper's first two women to serve in that capacity. In 1945, while working at the
Post, Youngman published
The Federal System in Wartime, on the subject of the Federal Reserve's role in financing war production. She retired from the
Post in 1952. == Later life ==