He has extensive editorial experience and is Cardiopulmonary Imaging Section Editor for AJR and Editor-in-Chief for Clinical Nuclear Medicine. In 2003, he completed a six-month sabbatical to study MR at Huntington Medical Research Institute. Dr Colletti was funded by the NIH from 2004 - 2008 to study the comparison of cardiac function by MRI with CT coronary calcium scores in 385 elderly volunteers from the South Bay Heart Watch cohort. He has completing NIH funded studies of 3T MRI of carotid artery plaque. Dr Colletti is Past-President of the Los Angeles Radiological Society and Past-President of the LARS Nuclear Medicine Section. He is Past-President of the SNMMI Correlative Imaging Council. He is Past- President of the American College of Nuclear Medicine and represents ACNM on the Board of Directors of the Academy of Radiology Research.