I think it could be Tolman Bunting from the episode, 18-5-4 . He is the one that runs a puzzle store as well as a security firm looking for a code breaker device to read encrypted files. He is caucasian, little less than six feet tall, short hair, slim build, not a deep voice, not quite high pitched but more nasal. Is intelligent, manipulative, knows computer systems, could easily or have someone hack into CBI and/or police computer systems. He enjoyed playing a chess game with Jane, so is competitive, perhaps a sign of enjoying cat and mouse games. What do you think?