James Hartle, a prominent physicist known for his contributions to general relativity and quantum cosmology, has passed away. His textbook on general relativity has been influential in undergraduate education. The academic community is mourning his loss, with various resources and tributes highlighting his work, including talks and publications on topics such as quantum mechanics and cosmology. Notable events celebrating his legacy include an 80th birthday party and upcoming activities at the Kavli Institute of Theoretical Physics. Despite his passing, Hartle's impact on the field continues to resonate through his extensive body of work and the resources available online.