The professional organizations series ranges from 1960 to 1989 and consists of nine sub-series relating to the different organizations in which Dr. Weaver has been involved. The American Association of Engineering Societies sub-series is the largest in the entire collection. It ranges from 1978 to 1989 and includes correspondence, reports, meeting agendas and minutes, publications, and drafts relating to the different committees and task groups in which Dr. Weaver participated. The American Institute of Chemical Engineers sub-series ranges from 1981 to 1986 and includes correspondence and reports. The American Institute of Electrical Engineers sub-series contains a conference paper authored by Dr. Weaver and Robert Miller, Jr. from 1960. The American Nuclear Society sub-series ranges from 1966 to 1984 and contains administrative documents, meeting agendas and minutes, and reports relating to Dr. Weaver’s involvement with the Planning Committee. The American Society of Mechanical Engineers sub-series ranges from 1981 to 1984 and contains correspondence and statements. The American Society for Engineering Education sub-series ranges from 1980 to 1986 and contains correspondence, reports, and statements. The general organizations sub-series ranges from 1981 to 1984 and contains conference proceedings, correspondence, ephemera, and statements from organizations about which there is little material. The WATTec sub-series ranges from 1983 to 1985 and includes correspondence, ephemera, and a speech given by Dr. Weaver at a meeting. The World Federation of Engineering Organizations sub-series ranges from 1983 to 1985 and includes administrative documents, agendas, correspondence, and reports.