Jantinus Mulder started his career in the graphic industry and is currently a publisher at Lanasta (Walburg Pers). He is a specialist in the model building of naval ships. He builds models, and has written about model building in various (trade) magazines and books.Henk Visser is the author of 'De Koninklijke Marine - foto's en feiten' ('Royal Netherlands Navy - photos and facts') and was an employee at the Dutch Navy Museum.