The International Astronomical Union (IAU) was founded in 1919. Its mission is to promote and safeguard the science of astronomy in all its aspects through international cooperation. Its individual members — structured into Divisions, Commissions, and Working Groups — are professional astronomers from all over the world, at the Ph.D. level and beyond, who are active in professional research and education in astronomy. The IAU has 12381 members. The Individual Members Directory contains 10168 names in 98 countries worldwide (These Individual Members are labeled as "active" in the IAU database: they have a valid, public email, and are affiliated to at least one Division.). Of those 74 are National Members. In addition, the IAU collaborates with various scientific organizations all over the world.