Delivering client engagements, drawing on and contributing to the firm's knowledge base within the bounds of whichever engagement he is staffed to.
Searches internal knowledge constantly while preparing client deliverables, and occasionally hits a wall — sometimes literally, when content from a different engagement he is not staffed to is invisibly excluded from his results. Authors engagement-specific notes as work progresses, aware they are scoped to this client only.
Knowing a colleague on a different engagement almost certainly solved a similar problem, with no legitimate way to find out until it clears the sanitisation review months later, if it ever does.
Delivering engagement work without inadvertently referencing or exposing another client's information — a standard he takes personally, not just as policy.