Stuart Dreyfus's 1990 paper names Werbos as the researcher usually credited with backpropagation, calls his derivation independent, and argues proper priority belongs to Kelley and Bryson

stuart-dreyfuspaul-werboskelley-brysonbackpropagationoptimal-controlpriority-disputehistory-of-ml

In "Artificial Neural Networks, Back Propagation, and the Kelley-Bryson Gradient Procedure" (Journal of Guidance, Control, and Dynamics 13(5):926–928, AIAA, 1990), Stuart E. Dreyfus writes that "proper credit for the BP method of solution has not been accorded to Kelley and Bryson," that "[o]ften the 1974 doctoral dissertation of Werbos is cited as the earliest reference," and that "Werbos independently developed a derivation similar to that of Dreyfus" — crediting Werbos's work as independently arrived at, not derivative of his own 1962 chain-rule derivation. The correction Dreyfus argues for is a priority claim, not a plagiarism charge: he names the researcher he thinks gets undue credit by name, and states plainly that the credit belongs instead to Henry Kelley (1960) and Arthur Bryson (1961), whose backward chain-rule iteration through multi-stage dynamical systems predates Werbos's dissertation by over a decade (claim-kelley-bryson-optimal-control-precursor, entity-henry-kelley, entity-arthur-bryson).

This is the specific documentary link, in Dreyfus's own words, between Werbos and the Kelley-Bryson priority dispute the vault already tracks at length — sharpening myth-werbos-invented-backpropagation's "contested" status with a named, contemporary correction from inside the control-theory literature, three decades before the vault started re-tracing the same ground. The method under dispute is the same "dynamic feedback" generalization of backpropagation Werbos's 1988 paper applied to the Natural Gas Market Model he had authored the EIA's official 1981 documentation for.