Jack Brennan was a Belt miner, and the first human to make contact with the Pak race. He encountered the Pak Phssthpok who visited the system to discover a legendary lost colony of Pak breeders. Brennan realised that Humans might be descendants of those breeders and Phssthpok would annihilate them, following the Protector urge to sense and destroy mutations. Brennan was fed Tree-of-Life and killed Phssthpok to protect humanity. As a result he was transformed into the first human Protector. He left the system to intercept the Pak fleet he expected. He was never heard of again.