Along with his brother, Marcel Schlumberger, Conrad Schlumberger formed one of the most well-known geophysicist duos of Germany. A pioneer in petroleum production, he co-established Schlumberger Ltd., one of the world’s largest oil-field service companies, with Marcel. Their technique of oil exploration offered a cheap alternative than the existing coring methods.
Best known for exploring the geology of the Tertiary Period, Alexandre Brongniart initially taught natural history and then became a professor of mineralogy. He also worked for the development of porcelain enameling in France. His other works include a classification of reptiles and the introduction of geologic dating.