Rod Johnstone is an American author and designer known for his contributions to the world of sailing. He is particularly recognized for creating the J/Boats line of sailboats, which has gained popularity among sailing enthusiasts for their performance and design. In addition to his work in boat design, Johnstone has written several books on sailing and yacht design. His expertise and passion for the sport have made him a respected figure in the sailing community, influencing both amateur and professional sailors alike.