After World War II, he became a businessman and the founder of a New York City bond brokerage house, as well as a spokesman for conservative political causes.

[1] Archie was born in Washington, D.C., the fourth child of President Theodore "T. R." Roosevelt Jr. and Edith Kermit Carow.

[2] After being expelled from Groton, Archie continued his education at the Evans School for Boys,[3] and graduated from Phillips Academy, Andover, Massachusetts, in 1913.

In the summer of 1932, Archie, former President Calvin Coolidge, former Solicitor General William Marshall Bullitt, Admiral Richard E. Byrd, and General James Harbord, among others, formed a conservative pressure group known as the National Economy League, which called for balancing the federal budget by cutting appropriations for veterans in half.

[7][8] Overcoming significant command ambiguities between American and Australian forces because of overlapping spheres of operation, Roosevelt played an important role in the Salamaua campaign.

His service was recognized when one of the hotly contested ridge-lines northwest of the island's Tambu Bay was named in his honor.

Later, it was referred to as "Roosevelt Ridge" as it was depicted in the official American and Australian campaign histories as well as the US Army Air Force World War II Chronology.

He joined the John Birch Society and was the founder of the Veritas Foundation, which was dedicated to rooting out presumed socialist influences at Harvard and other major colleges and universities.

Writing in the book America's Political Dynasties (Doubleday, 1966), Stephen Hess commented: "Archie Roosevelt has, in recent years, added the family's name to many ultra-rightist causes.

[16] In 1953 he joined the Empire State Society of the Sons of the American Revolution of which both his father and elder brother had been members.

He even went so far as to write and publish a 44-page pamphlet that attempted to prove Bunche had been working as an agent of the "International Communist Conspiracy" for more than two decades.

In the foreword to The Great Deceit: Social Pseudo-Sciences, Archie wrote: "Socialists have infiltrated our schools, our law courts, our government, our MEDIA OF COMMUNICATIONS.... the Socialist movement is made up of a relatively small number of people who have developed the TECHNIQUE OF INFLUENCING large masses of people to a VERY HIGH DEGREE.

"[19] Johnson's book, Color, Communism, and Common Sense, was quoted by G. Edward Griffin in his 1969 motion picture lecture More Deadly than War ... the Communist Revolution in America.

[citation needed] In 1958, as president of The Alliance, Inc., Roosevelt wrote the preface for Manning Johnson's semi-memoir, semi-polemical tract Color, Communism, and Common Sense.

The couple spent most of their married life in a pre-Revolutionary house on Turkey Lane in Cold Spring Harbor, New York, not far from Oyster Bay, where they had four children: In 1971, Archie's wife, Grace Lockwood Roosevelt, died in an automobile crash near her home on Turkey Lane in Cold Spring Harbor, with her husband at the wheel.