Hi,
Yes, actually Thespian actors are persistent by default if you use one of the multiproc bases and you don't specify the transient flag. This includes actor systems started by the director. The Director even has modes where it can setup a system service that starts Thespian at boot time to run as a boot-started daemon on the system.
If you are using the simpleSystemBase, then the actor system will quit once the application quits. If you are seeing the ActorSystem exiting, check to make sure you are using one of the multiproc system bases and that you don't ever call `ActorSystem().shutdown()`.
Regards,
Kevin