How to do discovery on non-party unnamed witness?
<blockquote>
  <p>How does one do discovery on a non-party only the opposing party knows?</p>
</blockquote>

<p>Suppose the opposing party filed a motion and an adequate response to the motion will require that discovery be done on some of the people referenced in the motion,  how does one go about getting the witness' name and contact info?  Can/should the discovery be served on the unnamed witness via the defendant's attorney?  Email the defendant's attorney and ask?</p>

<p>You can make a discovery request on opposing party first, and ask them formally to disclose the information related to the witnesses, via oral deposition or interrogatories. They may be uncooperative and delay you as much as they could. It would be much easier if you can get the information from a third-party (for example, the police) because you can subpoena them, and they usually have less incentive to be uncooperative.</p>

united-states federal-courts