Alan Greene took up the calotype process in 1998 as a reaction to digital photography. This led to his writing a technical manual, Primitive Photography, published in 2001. In 2003-2004, his paper-negative photography was featured at the Palazzo Caffarelli and the Maison Européenne de la Photographie, as part of their collaborative exhibit, Roma/Rome 1850. Since then, he has contributed to Etudes photographiques, the Encyclopedia of Nineteenth-Century Photography, and the Vocabulaire technique de la photographie. He resides in Cambridge, Massachusetts.