He doesn't appear to be a quant, based on his linkedin profile. Looks like he had a telecom background, so he was probably working on the architecture of their co-located trading platform. In the automated trading world, co-location means putting your machines at the exchange to reduce the latency of receiving market data and entering orders. For a high frequency strategy (i.e. tens or hundreds of thousands of trades per day), these improvements can really increase profits, and there is a huge arms race under way in industry to get the lowest latency.
