Don Lynch is a historian with the Titanic Historical Society. He co-authored the book Titanic: An Illustrated History in 1992 with Ken Marschall and later co-authored Ghosts of the Abyss. Lynch has an extensive collection of Titanic memorabilia and even more extensive knowledge of the subject, having researched the RMS Titanic along with Marschall since the early 1970s. His research includes interviews with survivors of the maritime disaster and dives to the Titanic shipwreck at the bottom of the Atlantic Ocean. He has collaborated with several other authors and documentary filmmakers as a consultant and archival material supplier. Lynch has appeared on several television documentaries about the sinking of the Titanic.
Lynch assisted James Cameron during the production of the film Titanic in 1997 and also appears, uncredited, in the film as passenger Frederick Spedden in two scenes. In his first scene, he watches his character's son spin a top on the boat deck. Then, just after the crash, he tosses a chunk of ice to another first class passenger.
At one time, Lynch also worked as Controller for a division of a major defense company where he was manager over several people.