He has writtenbooks, started two professional journals and served as a J.R.C.E.R.T. Principles of radiographic imaging: an art and a science. site visitor for forty years His teaching career spans more than thirty years, during which time he founded Lambda Nu, the national honor society for radiologic and imaging sciences. Radiographic Imaging A Charter Fellow and past president of A.E.I.R.S., Mr. Carlton gives presentations around the world and founded Lambda Nu, the national honor society for