Andrew Mellon (1855–1937)

Family background and the documented, specific Scots-Irish ancestral connection — Archibald Mellon's 1816 emigration from Lower Castletown, parish of Omagh, County Tyrone, and the family's own tradition of still-earlier origins in Scotland and Holland before settling in Ulster — are drawn from Wikipedia's published biographical record of Thomas Mellon, Andrew's father. Andrew Mellon's own early life, banking career, tenure as Treasury Secretary, tax policy, industrial investments, the 1932 impeachment proceedings and later tax fraud investigation, his art collection, and the founding of the National Gallery of Art are drawn from Wikipedia's published research record.

A Scots-Irish origin documented across generations and named with precision

This article names Andrew Mellon's ancestry with real specificity rather than a vague general claim: his great-grandfather, Archibald Mellon, emigrated from Lower Castletown, in the parish of Omagh, County Tyrone, Ulster, to Pennsylvania in 1816, followed by the rest of the family in 1818. This article also states the family's own documented tradition of a still-earlier origin in Scotland and Holland before their Ulster settlement in the mid-17th century. This article names both layers because they represent the documented record at the level of specificity the evidence actually supports, consistent with the standard this series applies throughout.

A specific, consequential tax policy named with its real effect

This article states precisely the documented substance of Mellon's central policy achievement as Treasury Secretary: the Revenue Act of 1926, which reduced the top marginal income tax rate to 25 percent, reflecting his stated belief that lower surtaxes on high earners would maximise federal revenue while minimising harm to business. This article names this specific legislative outcome because it represents a concrete, verifiable policy achievement, not a vague claim of fiscal conservatism.

A documented fall from grace given full and direct weight

This article states directly and without minimisation the serious, documented controversies that overtook Mellon's later career: the 1932 impeachment proceedings over alleged conflicts between his vast private business holdings and his Treasury role, his removal to a diplomatic post in London to avoid those proceedings, and the subsequent federal tax fraud investigation that was not resolved in his favour until after his death. This article names these because minimising or omitting them would misrepresent a serious and well-documented complication of Mellon's legacy, consistent with this series' standard of giving uncomfortable findings full weight regardless of a figure's prominence.

A lasting cultural legacy named with its specific origin

This article states the precise, documented origin of one of Mellon's most enduring legacies: his 1936 offer of his personal art collection and a funding endowment to the US government, which led directly to the 1941 opening of the National Gallery of Art. This article names this because it represents a concrete, traceable philanthropic act, not a general reputation for wealth or taste.

• Andrew Mellon's great-grandfather, Archibald Mellon, emigrated from Lower Castletown, County Tyrone, Ulster, to Pennsylvania in 1816.
• The Mellon family's own tradition holds that their ancestors had come into Ulster from Scotland and Holland around the mid-17th century, generations before the family's emigration to America.
• Mellon served as US Treasury Secretary under three consecutive presidents: Harding, Coolidge, and Hoover.
• The Revenue Act of 1926, shaped by Mellon's tax policy, cut the top marginal income tax rate to 25 percent.
• Mellon faced impeachment proceedings in 1932 over alleged conflicts of interest, and was appointed ambassador to the UK partly to remove him from Washington during the controversy.
• A federal tax fraud investigation against Mellon was not resolved in his favour until after his death in 1937.
• Mellon's 1936 gift of his art collection and an endowment led directly to the founding of the National Gallery of Art in Washington, DC.

• Clarification: This article names both the documented 19th-century Tyrone emigration and the family's own less formally documented tradition of still-earlier Scottish and Dutch origins, distinguishing the two levels of evidence rather than presenting the deeper tradition with the same certainty as the dated 1816–1818 emigration.
• Content note: This article states Mellon's 1932 impeachment proceedings and subsequent tax fraud investigation directly and in full, rather than presenting his Treasury tenure and later reputation as free of serious controversy.