Daniel Sloane is, in a word, a Mystery. He has worked for many organisations as an Infiltrator, Intelligence Gatherer or Analyst and Assassin, but none of his clients seem to know anything about him. Extensive enquiries yielded nothing bar his covername: "Archer". Daniel's real name is unknown to all but a select few, and reports state him as being "old, grumpy, fast, brutal and lacking in personality."
None of his clients have been able to directly insult his efficiency in the field.