Albert is a PhD student in Uppsala University, working on garbage collection in runtime for actor-based programming languages with shared mutable objects. Actor languages exploits isolated heaps to do concurrent GC, but fall short when multiple actors need to work on a shared mutable objects collaboratively, eg. concurrent data structure, because object copying is required to keep heap isolation. My work focuses on maintaining heap isolation conceptually and apply a different GC for shared mutable objects, and the challenge lies on the interaction between the shared mutable objects GC and the GC in each actor.