Every year as the doors of ALA’s Annual Conference and Exhibition swing open, the exhibition hall comes alive. It is a ritual that has been repeated, refined, and reimagined throughout ALA’s 150-year history. And at the center of it all, providing the innovations, solutions, and partnerships that have propelled our profession forward, are the exhibitors. To mark this milestone, we look back at the rich history of exhibitors at the conference—where it began, how it grew, and why, 150 years on, the exhibition floor remains one of the most vital spaces in our professional world.