Shortly after finishing his architectural studies, Herron went to work for London County Council, alongside Warren Chalk and Dennis Crompton.
Architects Peter Cook, Mike Webb, and David Greene had been meeting regularly as a group at a greasy spoon in Swiss Cottage, and had already self-published a pamphlet called "Archigram" (from "architecture" + "telegram").
In 1963 the group was invited by Theo Crosby to exhibit on "The Living City" at the Institute of Contemporary Arts, which became a manifesto of sorts.
[1] Between 1964 and 1966, the concepts for the Walking City were published in Archigram, consisting of multi-story buildings mounted on giant telescopic steel legs, creating an ovoid and insect-like form.
[3] Resembling the Maunsell Forts, they appeared warlike to some, leading Herron to be heckled at a conference in Folkestone in 1966 when he spoke about the Walking City.