Leopoldo Petreanu was born and raised in Buenos Aires, Argentina where he graduated in Biology at the University of Buenos Aires. He then moved to New York where he obtained a Ph.D. at The Rockefeller University studying how newly-generated neurons integrate into the circuits of the adult mouse olfactory bulb. He continued studying circuits, this time of the cerebral cortex of the mouse during his postdoctoral research at the Cold Spring Harbor Laboratory and the Janelia Farm Research Campus. Using novel circuit mapping and imaging methods he studied the connectivity and activity of the long-range inputs innervating the mouse cerebral cortex. His laboratory plans to study how the different areas of the cortex work in concert during behavior by using a combination of imaging, physiological and behavioral methods.