Kasper de Jong
Kasper de Jong was born in 1955 in The Hague (NL). He is a trained carpenter and ran a forwarding agency until his recent retirement. He has one daughter, is married and lives in Tönning.
His collections include all stamps on full sheets until 1952, all stamps on covers until 1952, designs and proofs, stationery (MNH), and fiscal stamps.
Dr. Georgi Popov
Dr. G. Popov was born on Jan. 10, 1944 in Plovdiv (Bulgaria). He is married and has one son. After studying chemistry and finishing his doctorate in Merseburg and Greifswald he worked as a chemist in Bulgaria and Germany until 2008. He has been interested in the philately of Bulgaria since the age of seven. Since 1979 he has been member of the philatelic club in Merseburg of 1878 e.V.
Exhibits and awards: “Bulgarian postal services until 1900” (large vermeil and special award „best exhibit of Bulgaria“ at FEPA exhibition Bulgaria ´99 in Sofia and at BULGARIA 2009), “Bulgaria´s provisionals by overprint” (large vermeil in NAPOSTA exhibition in Essen 2005). Various publications in German and Bulgarian philatelic periodicals. Various books on Bulgarian philately
Thomas Hitzler (born 1962) is a pharmacist, married, lives and works in Munich.
He has been fascinated by East Rumelia / South Bulgaria for twenty years and he is a recognized expert (and independent evaluator) for this difficult topic. Fifteen years ago, he started to collect Bulgarian classical stamps. Today his collections include East Rumelia and Bulgarian classical stamps and covers (incl. Ottoman postmarks), as well as Turkish stamps and covers until 1935.
Mr. Hitzler is founding member and treasurer of the ARGE Bulgaria and has published numerous articles in philatelic periodicals, as well as a number of books..
Prof. Dr. Waltraud Kokot
Born in Cologne in 1952. Professor of social / cultural anthropology at the University of Hamburg until 2013, now retired. She is married and lives in Tönning. Since summer 2014 she is editor of the ARGE- newsletters.
Her philatelic interests developed out of her anthropological research. Her first focus was on Albania (postal history until 1945 and proofs), today her main focus is on Bulgaria (until ca. 1920). Her collections include Sephardic and Armenian covers and documents, private stationery, designs and proofs, as well as townscapes on classical postcards.