Hi Vijay,
Thanks for clarifying. I'll see if I can find a query that works. However, if what you need is a list of users who created the artifacts, then you can query the 'Submitted By' field.
The' Submitted By' field is basically holding the user who created the artifact.
If Lookback API isn't helping then I'm certain you can do it with WS-API.
I'll see if I can find a Lookback API example for what you're asking. However, can you let me know if you can get this info by querying for 'Submitted By' field?
Thanks,
Sagi