As the flagship journal of the field, Conservation Biology represents a multidisciplinary, global constituency of conservation professionals--a constituency composed of more than 5200 authors representing 1500 organizations and 89 countries. Using bibliometric records of research published in Conservation Biology, I evaluated trends in authorship of research papers from 1987 to 2005. Authorship diversified and became increasingly collaborative over time. North Americans now compose one-half of primary authorship, down from 75% in the 1990s, and European primary authors contribute a quarter of the journal's contributed research. Forty-five countries were represented in volume 19 of the journal. The top three most-cited authors are Australian. The percentage of single-authored papers declined from 57% in 1987 to 18% in 2005. Collectively, academic institutions contribute the most research to Conservation Biology, although a government agency, the U.S. Department of Agriculture Forest Service, was the single most-productive organization. The maturing of conservation biology as a discipline, the complex geographic and multidisciplinary nature of conservation questions, and the increased ease of communication in a technologically connected world contribute to the increasingly diverse and collaborative Conservation Biology authorship.