Yes, once you have a pending lawsuit, you can propound a set of Form Interrogatories - General, and check boxes 4.1 and 4.2 to get an answer to your inquiry.
Here is the form, DISC-001:
Frank W. Chen has been licensed to practice law in California since 1988. The information presented here is general in nature and is not intended, nor should be construed, as legal advice for a particular case. This Avvo.com posting does not create any attorney-client relationship with the author. For specific advice about your particular situation, please consult with your own attorney.
Yes, you can get that information by checking off the box on the form interrogatories and serving them on the other side. They don't have to voluntarily give you that information until you ask for it in discovery.