The American Association of Variable Star Observers (AAVSO) provides a platform for all people who are interested in Variable Star astronomy to participate in the field. The association was founded in 1911 and has been growing ever since. They promote collaboration between armature and professional astronomers in order to facilitate a wide range of scientific research and education for all. It is a central place where people can share their observations and analyze data on variable stars. The head quarters is located in Cambridge, Massachusetts, but the associations network is world wide. Anyone who is interested in becoming a member can apply for membership by clicking on the links below.