David Cohn is an award-winning architect, photographer, and writer, who has spent decades teaching people how to use complex CAD/CAM/CAE and BIM software. But it just so happens that he is also an avid amateur astronomer, who once ground the mirror and built his own 8-inch Newtonian reflector telescope. He was also a long-time member of Amateur Astronomers, Inc. (AAI), the organization that operates the William Miller Sperry Observatory. He is the author of more than a dozen books on CAD and desktop publishing, and has now turned his attention back to his original passion... astronomy.