Massive stars play a crucial role in shaping their environment, accreting from dense protostellar disks and returning large amounts of energy as radiation and mass flows (“feedback”) that reach out to the intergalactic medium. Stellar evolution and feedback on larger scales are well-studied, but to date these communities rarely interact. In light of recent findings that show this connection is timely and crucial, this meeting will bring these communities together to interact, establish a set of common interfaces between the two problem domains, and propose where solutions across this interface will be found.