Griffiths, PhillipPhillipGriffiths2022-03-222022-03-22https://hdl.handle.net/20.500.12111/7979Clay Lecture at INI in June 2022. Based on joint work with Mark Green and Colleen Robles.This lecture will discuss the global structure of period mappings (variation of Hodge structure) defined over complete, 2-dimensional algebraic varieties. Some applications to moduli of general type algebraic surfaces will also be presented.en-USperiod mappingHodge theoryHodge structuresalgebraic varietiesLecture/speech