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The Large Area Picosecond PhotoDetector (LAPPD) Collaboration was formed in2009 to develop large-area photodetectors capable of time resolutions measuredin pico-seconds, with accompanying sub-millimeter spatial resolution. Duringthe next three and one-half years the Collaboration developed the LAPPD designof 20 x 20 cm modules with gains greater than $10^7$ and non-uniformity lessthan $15\%$, time resolution less than 50 psec for single photons and spatialresolution of 700~microns in both lateral dimensions. We describe the R\&Dperformed to develop large-area micro-channel plate glass substrates, resistiveand secondary-emitting coatings, large-area bialkali photocathodes, andRF-capable hermetic packaging. In addition, the Collaboration developed thenecessary electronics for large systems capable of precise timing, built upfrom a custom low-power 15-GigaSample/sec waveform sampling 6-channelintegrated circuit and supported by a two-level modular data acquisition systembased on Field-Programmable Gate Arrays for local control, data-sparcification,and triggering. We discuss the formation, organization, and technical successesand short-comings of the Collaboration. The Collaboration ended in December2012 with a transition from R\&D to commercialization.

A Brief Technical History of the Large-Area Picosecond Photodetector (LAPPD) Collaboration