William Delbert Gann
American businessman (1878–1955)
William Delbert Gann (June 6, 1878 – June 18, 1955) or WD Gann, was a finance trader who developed securities trading technical analysis methods.
Gann's market forecasting methods are purportedly based on geometry, astronomy, astrology, time cycle analysis, and other esoteric means.
Opinions are sharply divided on the value, profitability, and relevance of his work.
Career
Gann moved to New York City in 1903, working as a cotton broker in Texarkana before opening his brokerage firm, W.D. Gann & Company, in 1908.
By 1919, Gann launched The Supply and Demand Letter, a daily market newsletter with stock and commodity forecasts, followed by The Busy Man’s Service in 1923 for trading recommendations. His 1924 book, Truth of the Stock Tape, gained praise from The Wall Street Journal as his best work.
Gann often wrote in an esoteric and indirect style that many found difficult to follow; it was supposed that he could be doing so deliberately to conceal his true method.
In his private communication, Gann was much more direct and candid about his use of astrology. For example, in a private letter to a student, he openly demonstrated how he used planetary cycles to make predictions in the coffee market.
Effectiveness
Alexander Elder, in his book Trading for a Living, said "I interviewed W.D. Gann's son, an analyst for a Boston bank.
Begin with the source’s own compact description: “William Delbert Gann” is american businessman (1878–1955). The dossier treats that line as a proposition to test through William, Delbert and Gann, not as a finished interpretation.
Why this record matters
The phrase “american businessman (1878–1955)” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 2, 2026. The linked authority identifier is Q1399544. VIAF identifies the subject as 79451129. The Library of Congress control number is n91100234. 3 of 3 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1878, 1955, 1903 and 1908.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “William Delbert Gann”, its source revision and the description used here.
- Expand the search: follow William Delbert Gann primary sources, William Delbert Gann archive and William research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “William Delbert Gann”?
- Which cited source is closest to the event, object or claim?
- What terminology or title could unlock a more precise catalogue search?
Search terms from this dossier
This entry incorporates text from “William Delbert Gann” 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.