Larry Greene, born Lawrence Chorley, was a journalist and the brother of Harold Chorley. While he bore a striking similarity to his brother, he carried himself with more certainty and with less arrogance.
The two grew up in Monaghan, Northern Ireland with an abusive father. When Harold ("Harry") was seven, to his horror, he saw Lawrence defend himself and accidentally kill their dad. He refused to see this as an accident and the two boys had a ruined relationship. As they grew up, Harold resented Lawrence for, as he saw it, stealing credit for Harold's successes and assigning blame for failures. As adults, both went into journalism - Lawrence taking the name Larry Greene - and covered up their familial links, as well as working to give themselves English accents for their career. Greene could never fully erase the traces of his original accent.
He supported Chorley after the London Event, an act that almost ruined his career too. He was able to pull himself back up, and was enlisted by General Hamilton to help uncover the whereabouts of Colonel Lethbridge-Stewart when he went missing in April 1969. Once he'd served his purpose, Larry was dumped. He didn't take it well, and began to set out his own feelers into what was going on, but was soon warned off. (PROSE: The Schizoid Earth)
Over a month later he found himself helping Lethbridge-Stewart when the colonel was on the run, but Larry's help came at a price. A promise to explain what happened to the colonel in April. Larry learned that Lethbridge-Stewart had been kidnapped and tortured by the Eastern Bloc, the official lie that Lethbridge-Stewart kept to. (PROSE: Mutually Assured Domination)
Near the end of 1969, Chorley was still trying to expose Lethbridge-Stewart and forcing Larry Greene to assist; Greene considered this a dangerous obsession that was ruining his brother's career, and that he was doing better after backing off. Further straining things was that his brother remained bitter and envious of Greene's own recent career successes. Greene was dragged to Scotland but swiftly abandoned, at which point he fell in with HAVOC agent Samson Ware and fellow journalist Charlie Redfern in trying to find a rumoured selkie before Chorley could. (PROSE: The Lost Skin)