&quot;The married engineer, who is in his 30s, and has been quietly tracking down stolen bikes for the last year, spoke to the Guardian on the condition of anonymity amid increasing curiosity about his identity, motives and methodology.&quot;<p>I&#x27;m guessing the main reason he wants anonymity isn&#x27;t from criminals, but from his family, who would obviously kill him if they knew how much danger he&#x27;s putting himself into.