Australia and Oceania, especially overprints; Central, Eastern and Balkan Europe, especially overprints; Overprints of other areas especially related to wartime occupations (Boer War, World War I, World War II) & their aftermaths.
Selections from above areas
Australian Commonwealth including New Guinea and Papua: stamps; Poland and related areas (including Central Lithuania, Western Ukraine): stamps; 1914-23: British & Allied occupation overprints (especially of German Colonies): stamps.
Professional philatelic expert who issues large numbers of certificates
Statements and Certificates
Numerous articles, mainly on overprints of Australia and Papua New Guinea
Royal Philatelic Society, London; Bund Deutscher Philatelisten; American Philatelic Society and many other specialised Societies, Study Circles and Arbeitsgemeinschaften.
Committee Member of Australian Commonwealth Collectors Club; Committee Member of Philatelic Society of NSW