Eleanor Warrene Smallwood Beasley Niebell was born in Washington, D.C., the daughter of Graeme T. Smallwood and Dorothy Hubbell Smallwood. She was married in 1943, in Washington, D.C., to William Niester Beasley and the mother of twin daughters. Her second marriage in 1955, in Arlington, VA, to Paul Milton Niebell and the mother of two daughters and one son, deceased. She resided in Potomac, MD.
Mrs. Niebell's early education was in Washington, D.C., much under private tutelage. She later studied in Geneva, Switzerland and in Brussels, Belgium.
- National Gavel Society (Honorary President)
- Order of the Three Crusade 1096-1192 (2nd Vice President General)
- National Society Americans of Royal Descent (Treasurer General)
- Order of the Crown of Charlemagne in the United States of America (2nd Vice President)
- Order of Americans of Armorial Ancestry (Honorary President General)
- National Society Daughters of the American Revolution (past Vice President General, Honorary State Regent of Washington, D.C. Society)
- National Society Children of the American Revolution (Honorary Senior National President)
- National Huguenot Society (past Assistant Treasurer General, Scholarship Committee Member, Trustee of the DuBois Scholarship Fund, Washington D.C. Society)
- National Society Daughters of the Barons of Runnemede
- National Society Daughters of Colonial Wars (past Councilor of the Washington, D.C. Society)
- National Society Dames of the Court of Honor (Treasurer of the Washington, D.C. Society)
- Ladies of the Garter
- Order of the Crown in America
- The National Society of the Colonial Dames of America
- The Colonial Dames of America
- Club of Colonial Dames (2nd Vice President of the Washington, D.C. Club)
- Dames of the Loyal Legion of the United States (Treasurer of the Washington, D.C. Chapter)
- Hereditary Order Descendants of Colonial Governors (Councilor General)
- Hereditary Order of Descendants of Loyalists and Patriots of the American Revolution
- Sons and Daughters of the Colonial & Antebellum Bench & Bar 1565-1861
- Order of the First Families of Rhode Island and Providence Plantations 1636-1647 (charter member)
- National Society Women Descendants of the Ancient and Honorable Artillery Company (past Delegate)
- National Society Daughters of the American Colonists (past Treasurer of the Washington, D.C. Society)
- National Society Children of the American Colonists (Life Promoter)
- National Order of the Blue and Gray (life member)
- National Congress of Patriotic Organizations, Inc. (past Regent)
- NSSAR and NSCAR (Recipient of the Good Citizenship Medal; Daughters of Liberty; CAR SAR Gold Medal of Appreciation; CAR SAR Bronze Medal of Appreciation, Martha Washington Award and Three Oak Leaves; member George Washington Fellows; and was honored with institution of 'The Eleanor Smallwood Niebell Award'
The Most Venerable Order of the Hospital of St. John of Jerusalem (Commander Sister Grade III, C.St.J.)
Mrs. Niebell is the author of Centennial Plus One, The Centennial History of the National Society Children of the American Revolution 1895-1996. She was a member of the Smithsonian Benefactors Circle, and a life member of the Maryland PTA. Mrs. Niebell was an active member of St. George's Episcopal Church in Glenn Dale, MD.