This article provides a survey of the growth of research on Nonprofit Sector and Voluntary Action Research, now termed simply voluntaristics. The author founded the organized, global, interdisciplinary, socio-behavioral science field of voluntaristics in 1971, with his formation and establishment of the Association for Research on Nonprofit Organizations and Voluntary Action (ARNOVA; www.arnova.org). Voluntaristics, after more than 40 years of growth, now qualifies as a new, global, integrative, academic discipline in the socio-behavioral sciences and related social professions, not just as one of many interdisciplinary fields of research, according to six defining criteria for a discipline.