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Dennis Weatherstone

British banker (1930-2008)

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General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionJul 25, 2026
Entity authorityQ5259060
Source-derived summary

Sir Dennis Weatherstone KBE (29 November 1930 – 13 June 2008) was the former CEO and chairman of J. P. Morgan & Co.

Biography

Born in London, England, Weatherstone attended North Western Polytechnic. In 1946, at the age of 16, he was hired as a bookkeeper and was quickly promoted to the foreign exchange trading desk at the Guaranty Trust Company, a predecessor firm in London. He rose through the ranks, becoming Morgan's chairman and CEO in 1991. He retired from J. P. Morgan in 1995 and was succeeded by Douglas "Sandy" Warner III.

Weatherstone became a vice chairman and director in 1979, chairman of the executive committee a year later and president in 1987. In 1990, he was named chairman and chief executive officer and was knighted by Queen Elizabeth II—the first J.P. Morgan employee to receive the honour.

Later that year, he helped the firm earn Federal Reserve authority to trade and sell corporate stocks, making J. P. Morgan the first bank-related securities firm with a full range of securities powers. A decade later, the Glass–Steagall Act was repealed, allowing banking companies to provide any service, whether it be a loan, advice or a securities offering.

JPMorgan invented value-at-risk (VaR) as a tool for measuring exposure to trading losses. The tool emerged in the wake of the 1987 stock market crash when Weatherstone asked his division chiefs to put together a briefing to answer the question: "How much can we lose on our trading portfolio by tomorrow's close?"

Weatherstone served as an independent member of the Board of Banking Supervision of the Bank of England from 1995 through 2001.

Editorial summary

This brief starts where responsible research should: with the source description of “Dennis Weatherstone” as british banker (1930-2008). Everything that follows is an evidence route, not borrowed authority.

Editorial reviewA concise reference frame for defining the subject, testing terminology and identifying the institution closest to the evidence. The current lead gives the account dated anchors—1930, 2008, 1946, 1991—that can be checked directly. The linked authority record independently contributes the date 1930-11-29. The account is most persuasive where Dennis, Weatherstone and British can be independently traced.
Editorial analysis

Why this record matters

The subject matters to the general reference register because the source frames it as british banker (1930-2008). Its deeper value depends on whether names, dates, institutions and citations support that framing.

Evidence profile

Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Jul 25, 2026. The linked authority identifier is Q5259060. VIAF identifies the subject as 14368563. The Library of Congress control number is no96064048. 3 of 3 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1930, 2008, 1946 and 1991.

Critical limits

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How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

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Source & attribution

This entry incorporates text from Dennis Weatherstone” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.