A professional genealogist works with clients to trace their family roots through public records and historical documents. As a professional genealogist, you consult with clients to find out what they already know about their ancestry and what they hope to learn from genealogical research. You use data from DNA testing in conjunction with contextual information that your clients provide as a starting point for your research. Exploring immigration records, property and tax records, birth certificates, marriage certificates, and death certificates, you put together a family tree that your clients can share with their descendants.