Overview
Over 21 years in Silicon Valley (1978-1999), Blank worked at 8 technology startups, founding or co-founding 4 of them. This period provided the raw material from which he would later extract the Customer Development methodology — the pattern recognition across successes and failures that revealed what worked and what did not.
Key Companies
Note: Some sources (Wikipedia, CHM) list a Pixar consulting stint among the 8 startups; the list above follows Blank's own canonical telling with E.piphany as the 8th.
Key Characteristics
Blank's self-assessment — "two large craters, one dot-com bubble home run, and several base hits" — captures the experiential diversity that made Customer Development possible. The failures (Ardent, Rocket Science Games) were as important as the successes: they showed Blank what went wrong when startups followed conventional product development processes without validating the underlying business model.
Significance
This era is the laboratory from which Customer Development emerged. Without the pattern recognition across 8 startups — seeing the same failure modes repeat in different contexts — Blank could not have codified the methodology. The transition from practitioner to theorist happened at the boundary of this era: Blank retired the day before E.piphany's IPO and began reflecting on what he had learned.