can't retrieve task's creator

Hello, I implemented the service in a Laravel app. We are using a custom workflow where once a task is ready for submission we reassign it to Its creator. I did not found the related property in task object (through the api doc).
I noticed there is a followers list and it seems the first element as first follower is the creator of the task.
That is what I though because last time we had issue with bad reassignments.
So, my question is: how to retrieve task’s creator?
Thanks for help : )


Did you ask for this field in the opt_fields?


Thank you : ), I did not understood that attributes are required in opt fields.