Inspired by his father's work, Louis de Loczy pursued eagerly his undergraduate course of geology in the University of Zurich, the famous E.T.H.
From 1922 onwards he worked under contract with Royal Dutch Shell, when he carried out geological exploration in Sumatra, Java, Borneo, Timor and Celebes (presently Indonesia); and also in Ecuador, Peru, Romania, Yugoslavia, Polonia and Hungary.
During this time he devoted himself to education and training of Hungarian students of geology and with this team discovered the oil fields as well as the deposits of bauxite, iron and manganese ores, and coal.
His group in the Institute under his direction helped to launch the projects of irrigation of the Hungarian plains and location of dam sites in the valley of Wagg, then part of Czechoslovakia.
After World War II by the suggestion of Professor Martonne he executed geological exploration in the French Morocco for the Societé Chérifiennne des Petroles.
During this time he did geological explorations in the Adama Basin and in the southeast of Anatolia and contributed significantly for the development of the oil field of Raman Dagh.
While de Loczy was working abroad the Hungarian Communist revolution began and he was urged to return immediately to his country under the threat of confiscation of his estates, money assets and even his nationality.
From 1950 to 1951 as a consultant to the Institute of Soil Research of the Ministry of Coordination of Greece, Loczy carried out geological mapping and oil exploration in West Tratia, Epyrus.
By the end of 1951 he was hired by the Government of Paraguay to execute geological work in Asuncion aimed at solving hydrogeological problems in that country.