Arthur founded Dune Forum, a short-lived cultural magazine aimed to spread alternating religious and political ideologies.

After his father's death, he inherited various official documents, including newspapers during the time of his grandfather's presidency and presidential memento.

Arthur II was an indirect stakeholder in the Trinchera Estate, a 250,000 acres (1,000 km2) ranch which was one of the main source of income for his family.

[5] After leaving college, Arthur worked in the Irish Republican Movement, living in New York, France, and Ireland.

[1] Arthur founded an art and literature commune and published a short-lived magazine, Dune Forum,[1] with an intention to "express the creative thought of America looking not toward Europe but toward the West" and spread alternating religious and political ideologies.

[8] Amy Hart wrote that the magazine was a "platform where Dunites could express their varied worldviews and religious ideals".

Upon his father's death in 1937, all of Arthur II's financial assets were distributed equally between his son Gavin and his wife.

[14] A sexologist by profession,[15] Arthur published The Circle of Sex in 1962 that analyzed human sexuality through the lens of yin-yang polarities.

Rather than the linear scale developed by Alfred Kinsey, Arthur envisioned sexuality as a wheel with twelve orientations, six for each sex.

[16] The twelve types corresponded to the 12-hours dial clock and Arthur illustrated each with a historical archetype, like Don Juan, Sappho, and Lady C.[16] In 1966, he published an enlarged edition of the same title.

[20] According to various of his friends, including F. Scott Fitzgerald, Ernest Hemingway, Eleanor Roosevelt, and Winston Churchill,[14] Arthur would refer to himself as a "pre-hippie hippie".

[23] Philip Avillo wrote that "Throughout his life, Arthur cultivated a wide variety of people, including political leaders, writers, entertainers, sexologists, and social misfits and outcasts.