Patrick Maselis is a fourth generation philatelist who has won numerous international awards for his exhibits of the Congo Free State and the 1849-1863 "medallion" issues of his native Belgium. Since 2009 he has been president of Club de Monte-Carlo de l'Elite de la Philatélie and served as general commissioner of its Monaco Phil exhibitions In 2012, he was invited to sign the Roll of Distinguished Philatelists. He is also a fellow of the Royal Philatelic Society London and was elected president of the Royal Philatelic Society London for two years from June 2017 in succession to Frank Walton.
A chemist by training, he is managing director of a major Belgian cereal manufacturing plant. He lives with his wife and two children in Roeselare.