Charles Rudd Mackenzie is a genealogist with more than 25 years of experience in researching U.S. and European ancestral records. He has served as the verifying genealogist for the National Society of Colonial Dames in the State of New York, Holland Society, the Huguenot Society, Colonial Wars New York & Colonial Wars Rhode Island, registrar and chief genealogist of the Military Society of the War of 1812, and the assistant genealogist of the Saint Nicholas Society. He also has experience with Mayflower, Jamestowne, and many other kinds of member applications. He is the author of the Mackenzie-Taylor Genealogy, The Knickerbocker 100, and biographical articles for the Society of the Cincinnati and other hereditary organisations. Since 2020, he has been serving at the President of the Saint Nicholas Society of the City of New York. Other organisations Mackenzie has served as a board member include Gitt-Moul Historic Properties, Navigators USA, Volunteers of Peace, and Delta Kappa Epsilon Fraternity.