Organization Metaphysical Club

Harvard University

Anti-Imperialist League

American Society for Psychical Research (founder)

American Psychological Association (founder)

Theosophical Society

United States Coast Survey

Johns Hopkins University

Supreme Court of the United States (Associate Justice, 1902-1932)

Massachusetts Supreme Judicial Court (1882-1902)

Phi Beta Kappa

Porcellian Club

Hasty Pudding Club

Massachusetts Volunteer Infantry

Harvard Law Review

Massachusetts Bar

American Law Review

Shattuck, Holmes, and Munroe

Harvard Law School

Supreme Judicial Court of Massachusetts

Harvard University

Unitarian Church

Free Religioous Association

The Index (weekly)