Organization Sigma Alpha Epsilon

British Armed Forces

American Academy of Arts and Letters

University of Mississippi (postmaster)

Metro-Goldwyn-Mayer (screenwriter)

Warner Brothers (screenwriter)

University of Virginia (writer-in-residence)

National Institute of Arts and Letters

Order of Saint Benedict (oblate | 1990)

Fellowship of Southern Writers (founding member | 1987)

Loyola University of New Orleans

Confederate Army

Peabody Orchestra

Johns Hopkins University

Minnesota Vikings

New York Giants

Tarkenton Software

KnowledgeWare

Clark University

American Rocket Society

Institute of Aeronautical Studies

National Aeronautics Association

American Institute of Social Sciences

American Association for the Advancement of Science

American Physical Society

American Meteorological Society

American Geophysical Union

Sigma Xi

Historical Commission (SC)

Phi Beta Kappa

Kosmos Club (Columbia, SC)

Phi Beta Kappa

Delta Sigma Rho

Taylor & Francis Group

Independence Blue Cross