Alan Jefferis has been an instructor of drafting technology at Clackamas Community College, an Authorized AutoCAD Training Center in Oregon City, Oregon for over fifteen years. He has also taught for four years at Mt. Hood Community College in Gresham, Oregon. His professional experience includes eight years of drafting for structural engineers and sixteen years of residential designing. He is currently the owner of Residential Designs, A.I.B.D.Alan Jefferis is the author of 'Workbook for Jefferis/Madsen's Architectural Drafting and Design, 5th', published 2004 under ISBN 9781401871871 and ISBN 1401871879.