[4] Post's complete collection of personal papers, as well as those of her father, are held by the University of Michigan's Bentley Historical Library.

She, along with her second husband, E.F. Hutton, began expanding the business and acquiring other American food companies such as Hellmann's Mayonnaise, Jell-O, Baker's Chocolate, Maxwell House, and many more.

Post foresaw the future advantages of frozen food, and bought Birdseye's company, which eventually became a success.

[9] Post funded a U.S. Army hospital in France during World War I, and, decades later, the French government awarded her the Legion of Honour, in the degree of Commander.

Starting in 1929 and throughout the Great Depression, she financed and personally supervised a Salvation Army feeding station in New York.

Post College, located on her former Long Island estate, she became honorary housemother of Zeta Beta Tau's Gamma Delta chapter, often hosting the fraternity brothers for brunches.

have claimed that these items were expropriated; however, the transactions by Post and her third husband, Joseph E. Davies,[a] were from the recognized governmental authority.

From November 1936 to June 1938, in a crucial period leading up to World War II, Davies served as the American ambassador to the Soviet Union, ruled at that time by Joseph Stalin.

Post accompanied Davies to Moscow, and they acquired many valuable Russian works of art from Soviet authorities at very reasonable prices.

May, a wealthy Pittsburgh businessman and the former master of fox hounds of the Rolling Rock Hunt Club in Ligonier, Pennsylvania.

Anne Francis portrayed Merriweather Post in the 1987 miniseries Poor Little Rich Girl: The Barbara Hutton Story.

She was portrayed by Morgan Bradley in the History Channel docudrama series The Food That Built America, which debuted in 2019.

A fictionalized version of Merriweather Post was played by Amy Schumer in the 2024 Netflix film Unfrosted written by Jerry Seinfeld.

[31] Merriweather Post Pavilion in Columbia, Maryland, is named in her honor because of her years of sustained financial support for the National Symphony.