Biographies of women scientists are few in number. This volume fills that gap in the literature. It includes extensive profiles, arranged alphabetically, of 75 women from different countries who have been influential in the development of chemistry and physics. Subjects were chosen on the basis of their advanced degrees, innovative research, influence in teaching, leadership in the profession, and scholarly publications. Each profile includes a biography, a career discussion, and a bibliography of works by and about the subject. Biographies provide personal information with special attention to influences on the subject's career. The career discussions indicate the significance of the subject's contributions in language accessible to the layperson. The work provides a valuable contribution to both women's studies and the history of chemistry and physics and should serve as an inspiration to young women seeking a career in the physical sciences.