Born in Yorkshire, England, he lived in Ottawa, Montreal and Toronto before settling in Halifax and as a marine consultant, specializing in ship preservation and maintenance. Walker worked for shipbuilders, such as German and Milne, the Canadian Navy and Lloyds Register of Shipping. He has been a Research Associate at the Maritime Museum of the Atlantic in Halifax since 1985 and conducted a Small Craft Survey of Nova Scotia from 1990 to 1993. Walker is the author, with Wayne Barrett photographer, of Small Wooden Boats of the Atlantic as well as numerous articles on vessel design, preservation of historic vessels and marine history. Walker is currently preparing a definitive history of the Cape Islander fishing boat and a book on shipwrecks of the Cunard Line.