APS offices and the Library will be closed until further notice. On-site events are suspended through April 30, but read more about virtual programming and resources that can be accessed remotely. Read more about the APS response to COVID-19.

Celebrating 275 Years of Promoting Useful Knowledge

Center for Digital Scholarship

To mark the 275th anniversary of the American Philosophical Society in 2018, this timeline highlights key events that helped define the APS during its illustrious history.