the National Institute of Mental Health. In 1975, Guttentag co-edited (with Elmer Struening) the two-volume Handbook of Evaluation Research which served as a reference guide to research methodology in what was then a new field of study (Volume 1), with the methodology illustrated using case-studies of evaluation research (Volume 2). Guttentag died suddenly of a heart attack on November 4, 1977. Research At the time of her death, Guttentag was writing a manuscript for a book on the societal implications of imbalanced sex-ratios, which her husband Paul Secord later completed (with co-authorship). Too Many Women?: The Sex Ratio Question explored possible effects of sex ratios on social systems and human relationships, and argued that these ratios have profound effects on societal values and treatment of women. The project began in 1975 after Guttentag and her family had watched Mozart’s The Magic Flute. As compared to popular music of the 1970s, The Magic Flute and other songs of the classical period were much more romantic, glorifying courtship and the institution of marriage. Guttentag subsequently examined census data from towns in late 19th-century, and observed that the sex ratio at birth for seven of eight ethnic groups was around 106 males for every 100 females (the outlier being Jewish communities where the sex-ratio even more strongly favored males). In contrast, in the 1970s, the sex-ratio of adult men to adult women in the United States had dropped below 1.0. Guttentag concluded from her research that when men outnumbered women, marriages tended to be most stable, whereas when women outnumbered men, women were more likely to be treated as sex objects and experience divorce, but also more likely to work outside of the home and have increased political rights. Her thesis that sex-ratios have broad impact on social behavior aligns well with more recent work drawing links between sex-ratios and male-female power dynamics and sexual behavior. Books Guttentag, M., & Bray, H. (1976). Undoing sex stereotypes: Research and resources for educators . McGraw-Hill. Guttentag, M., Oglesby, M., Kiresuk, T., & Cahn, J. (1975). The evaluation of training in mental health. New York: Behavioral Publications. Guttentag, M., Salasin, S., & Belle, D. (Eds.). (1980). The mental health of women (Vol. 23). Academic Press. Guttentag, M., & Secord, P. F. (1983). Too many women?: The sex ratio question . Sage. Struening, E.L., & Guttentag, M. (1975). Handbook of evaluation research . Sage. Representative publications Denmark,