The Pasadena Digital History Collaboration, or PDHC, is the people and institutions of Pasadena working together to bring the city’s rich history and traditions in one place, and tell the story of Pasadena to the world.

The PDHC was established in 2010 by three of the city’s premier historical institutions – Pasadena City College Shatford Library, Pasadena Museum of History, and Pasadena Public Library.