12 people are the primary owner of at least one file in 2233admin/gs-quant, and Roberson, Martin [GBM Public] owns the most: 172 files, or 41% of the codebase. The truck factor is 2: that is how few people would have to leave before the majority of owned files lose their owner. 161 files have exactly one contributor.
Engineering-leader view of who owns what: silos, hotspots, dead code, and bus-factor risk by person.