Douglas Richardson is a prominent American genealogist and historian known for his work in the field of lineage research. He has contributed significantly to the study of royal and noble ancestry, particularly in relation to British and European history. His expertise has made him a respected figure among genealogical societies. In addition to his research, Richardson is the author of several books and articles that focus on medieval and early modern genealogy. He is also known for his involvement in various genealogical projects and organizations, helping to advance the understanding of family histories and connections across generations.