From the PS to the LHC 50 years of Nobel memories in high energy physics This collection of lectures and essays by eminent researchers in the field many of them Nobel laureates is an outgrowth of a special event held at CERN in December 2009 coinciding with the start of LHC operations. Careful transcriptions of the lectures have been worked out subsequently validated and edited by the lecturers themselves. This unique insight into the history of the field includes also some perspectives on modern developments and will benefit everyone working in the field as well as historians of science.