Hologic, Inc. is a developer and manufacturer of medical X-ray imaging instruments with a primary focus on mammography and women's health. The company was founded in 1985 by S. David Ellenbogen (1938-2001) and Jay A. Stein (1942-) in Bedford, Massachusetts. This oral history collection brings together interviews with the individuals involved in inventing, researching, and commercializing digital mammography and breast tomosynthesis at DuPont, Sterling and Hologic.