Ted Hoff — Bernard Widrow's Stanford PhD student and co-inventor of the LMS/ADALINE — went on to architect the Intel 4004, the first commercial microprocessor

Marcian "Ted" Hoff completed his Stanford PhD under Bernard Widrow in the early 1960s, and the dissertation work was not incidental to neural-network history: Hoff co-invented the least-mean-squares (LMS) filter and the ADALINE with Widrow. LMS is the single-layer gradient-descent rule at the base of the Madaline line (claim-madaline-rule-i-first-layer-trainable-second-fixed); ADALINE is the adaptive linear element it trained. The same person, in other words, sits at the origin of the adaptive-filter lineage the vault maps around the backpropagation-gap.

Hoff then left neural-net research for Intel, joining in 1968 as one of its earliest employees. There he is credited with proposing the general-purpose-processor architecture — a single programmable "universal" chip in place of a set of custom logic circuits — that became the Intel 4004 (1971), the first commercial microprocessor. Busicom had specified a multi-chip calculator design — a seven-chip proposal, per Wikipedia's "Intel 4004" article; the cited "Marcian Hoff" article does not carry this detail — and Hoff's counter-proposal of a compact programmable CPU (the four-chip CPU/ROM/RAM/I-O architecture) was adopted instead. (The transistor-level silicon design of that chip was executed separately by Federico Faggin — see claim-faggin-4004-designer-argues-classical-silicon-cannot-be-conscious.)

This is the concrete bridge behind the passing note, in claim-widrow-abandoned-multilayer-training-until-1985-backprop, that "Hoff went to Intel": Widrow's own PhD student and LMS co-author is also the architect of the microprocessor. Two fields not usually spoken in one sentence — 1960s neural-network theory and the invention of the CPU — share a single genealogical link. See moc-backpropagation-origins.