During World War II he embarked on a spying mission in Germany for the Front de l'Indépendance Belgian communist resistance organization, bringing back the first reliable information about the fate of Jews deported to Germany, as well as detailed information about the functioning of the Auschwitz concentration camp.
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L'Indépendance Roumanie ('The Independence of Romania') was a French language liberal daily newspaper published from Bucharest.
He wrote important works on the ancient kingdoms of Asia Minor–Trois royaumes de l'Asie Mineure, Cappadoce, Bithynie, Pont (1888), Mithridate Eupator (1890); also a critical edition and translation with H Weil of Plutarch's Treatise on Music; and an Histoire des Israélites depuis la ruine de leur indépendance nationale jusqu'à nos jours (2nd ed., 1901).